diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt
index 1fab347ad..a5504a4a3 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt
@@ -179,6 +179,7 @@ import com.vitorpamplona.quartz.nip99Classifieds.ClassifiedsEvent
 import com.vitorpamplona.quartz.nipB7Blossom.BlossomServersEvent
 import com.vitorpamplona.quartz.utils.Hex
 import com.vitorpamplona.quartz.utils.LargeCache
+import com.vitorpamplona.quartz.utils.LargeSoftCache
 import com.vitorpamplona.quartz.utils.TimeUtils
 import kotlinx.collections.immutable.ImmutableList
 import kotlinx.collections.immutable.toImmutableList
@@ -208,9 +209,9 @@ interface ILocalCache {
 object LocalCache : ILocalCache {
     val antiSpam = AntiSpamFilter()
 
-    val users = LargeCache<HexKey, User>()
-    val notes = LargeCache<HexKey, Note>()
-    val addressables = LargeCache<Address, AddressableNote>()
+    val users = LargeSoftCache<HexKey, User>()
+    val notes = LargeSoftCache<HexKey, Note>()
+    val addressables = LargeSoftCache<Address, AddressableNote>()
 
     val chatroomList = LargeCache<HexKey, ChatroomList>()
     val publicChatChannels = LargeCache<HexKey, PublicChatChannel>()
@@ -2163,6 +2164,12 @@ object LocalCache : ILocalCache {
         return newNotes
     }
 
+    fun cleanMemory() {
+        notes.cleanUp()
+        addressables.cleanUp()
+        users.cleanUp()
+    }
+
     fun cleanObservers() {
         notes.forEach { _, it -> it.clearFlow() }
         addressables.forEach { _, it -> it.clearFlow() }
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/model/MediaAspectRatioCache.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/model/MediaAspectRatioCache.kt
index dcf2401ef..b4b199f9d 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/model/MediaAspectRatioCache.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/model/MediaAspectRatioCache.kt
@@ -23,7 +23,7 @@ package com.vitorpamplona.amethyst.model
 import android.util.LruCache
 
 interface MutableMediaAspectRatioCache {
-    fun get(url: String): Float
+    fun get(url: String): Float?
 
     fun add(
         url: String,
@@ -35,7 +35,7 @@ interface MutableMediaAspectRatioCache {
 object MediaAspectRatioCache : MutableMediaAspectRatioCache {
     val mediaAspectRatioCacheByUrl = LruCache<String, Float>(1000)
 
-    override fun get(url: String) = mediaAspectRatioCacheByUrl.get(url)
+    override fun get(url: String): Float? = mediaAspectRatioCacheByUrl.get(url)
 
     override fun add(
         url: String,
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/eventCache/MemoryTrimmingService.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/eventCache/MemoryTrimmingService.kt
index 1006244a5..6d31d5578 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/eventCache/MemoryTrimmingService.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/eventCache/MemoryTrimmingService.kt
@@ -36,6 +36,7 @@ class MemoryTrimmingService(
         account: Account? = null,
         otherAccounts: List<AccountInfo>,
     ) {
+        cache.cleanMemory()
         cache.cleanObservers()
 
         account?.let {
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/utils/LargeCache.kt b/quartz/src/main/java/com/vitorpamplona/quartz/utils/LargeCache.kt
index a1bd268bc..bd61c05d1 100644
--- a/quartz/src/main/java/com/vitorpamplona/quartz/utils/LargeCache.kt
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/utils/LargeCache.kt
@@ -170,25 +170,25 @@ class LargeCache<K, V> {
         return runner.count
     }
 
-    public fun <T, U> associate(transform: (K, V) -> Pair<T, U>): Map<T, U> {
+    fun <T, U> associate(transform: (K, V) -> Pair<T, U>): Map<T, U> {
         val runner = BiAssociateCollector(size(), transform)
         innerForEach(runner)
         return runner.results
     }
 
-    public fun <T, U> associateNotNull(transform: (K, V) -> Pair<T, U>?): Map<T, U> {
+    fun <T, U> associateNotNull(transform: (K, V) -> Pair<T, U>?): Map<T, U> {
         val runner = BiAssociateNotNullCollector(size(), transform)
         innerForEach(runner)
         return runner.results
     }
 
-    public fun <U> associateWith(transform: (K, V) -> U?): Map<K, U?> {
+    fun <U> associateWith(transform: (K, V) -> U?): Map<K, U?> {
         val runner = BiAssociateWithCollector(size(), transform)
         innerForEach(runner)
         return runner.results
     }
 
-    public fun <U> associateNotNullWith(transform: (K, V) -> U): Map<K, U> {
+    fun <U> associateNotNullWith(transform: (K, V) -> U): Map<K, U> {
         val runner = BiAssociateNotNullWithCollector(size(), transform)
         innerForEach(runner)
         return runner.results
@@ -227,338 +227,338 @@ class LargeCache<K, V> {
         buffer.append(postfix)
         return buffer.toString()
     }
-}
 
-fun interface BiFilter<K, V> {
-    fun filter(
-        k: K,
-        v: V,
-    ): Boolean
-}
-
-class BiFilterCollector<K, V>(
-    val filter: BiFilter<K, V>,
-) : BiConsumer<K, V> {
-    var results: ArrayList<V> = ArrayList()
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        if (filter.filter(k, v)) {
-            results.add(v)
-        }
+    fun interface BiFilter<K, V> {
+        fun filter(
+            k: K,
+            v: V,
+        ): Boolean
     }
-}
 
-class BiFilterUniqueCollector<K, V>(
-    val filter: BiFilter<K, V>,
-) : BiConsumer<K, V> {
-    var results: HashSet<V> = HashSet()
+    class BiFilterCollector<K, V>(
+        val filter: BiFilter<K, V>,
+    ) : BiConsumer<K, V> {
+        var results: ArrayList<V> = ArrayList()
 
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        if (filter.filter(k, v)) {
-            results.add(v)
-        }
-    }
-}
-
-fun interface BiMapper<K, V, R> {
-    fun map(
-        k: K,
-        v: V,
-    ): R?
-}
-
-fun interface BiMapperNotNull<K, V, R> {
-    fun map(
-        k: K,
-        v: V,
-    ): R
-}
-
-class BiMapCollector<K, V, R>(
-    val mapper: BiMapper<K, V, R?>,
-) : BiConsumer<K, V> {
-    var results: ArrayList<R> = ArrayList()
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        val result = mapper.map(k, v)
-        if (result != null) {
-            results.add(result)
-        }
-    }
-}
-
-class BiAssociateCollector<K, V, T, U>(
-    val size: Int,
-    val mapper: BiMapperNotNull<K, V, Pair<T, U>>,
-) : BiConsumer<K, V> {
-    var results: LinkedHashMap<T, U> = LinkedHashMap(size)
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        val pair = mapper.map(k, v)
-        results.put(pair.first, pair.second)
-    }
-}
-
-class BiAssociateNotNullCollector<K, V, T, U>(
-    val size: Int,
-    val mapper: BiMapper<K, V, Pair<T, U>?>,
-) : BiConsumer<K, V> {
-    var results: LinkedHashMap<T, U> = LinkedHashMap(size)
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        val pair = mapper.map(k, v)
-        if (pair != null) {
-            results.put(pair.first, pair.second)
-        }
-    }
-}
-
-class BiAssociateWithCollector<K, V, U>(
-    val size: Int,
-    val mapper: BiMapper<K, V, U?>,
-) : BiConsumer<K, V> {
-    var results: LinkedHashMap<K, U?> = LinkedHashMap(size)
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        results.put(k, mapper.map(k, v))
-    }
-}
-
-class BiAssociateNotNullWithCollector<K, V, U>(
-    val size: Int,
-    val mapper: BiMapper<K, V, U>,
-) : BiConsumer<K, V> {
-    var results: LinkedHashMap<K, U> = LinkedHashMap(size)
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        val newValue = mapper.map(k, v)
-        if (newValue != null) {
-            results.put(k, newValue)
-        }
-    }
-}
-
-class BiMapUniqueCollector<K, V, R>(
-    val mapper: BiMapper<K, V, R?>,
-) : BiConsumer<K, V> {
-    var results: HashSet<R> = HashSet()
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        val result = mapper.map(k, v)
-        if (result != null) {
-            results.add(result)
-        }
-    }
-}
-
-class BiMapFlattenCollector<K, V, R>(
-    val mapper: BiMapper<K, V, Collection<R>?>,
-) : BiConsumer<K, V> {
-    var results: ArrayList<R> = ArrayList()
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        val result = mapper.map(k, v)
-        if (result != null) {
-            results.addAll(result)
-        }
-    }
-}
-
-class BiMapFlattenUniqueCollector<K, V, R>(
-    val mapper: BiMapper<K, V, Collection<R>?>,
-) : BiConsumer<K, V> {
-    var results: HashSet<R> = HashSet()
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        val result = mapper.map(k, v)
-        if (result != null) {
-            results.addAll(result)
-        }
-    }
-}
-
-fun interface BiNotNullMapper<K, V, R> {
-    fun map(
-        k: K,
-        v: V,
-    ): R
-}
-
-class BiNotNullMapCollector<K, V, R>(
-    val mapper: BiNotNullMapper<K, V, R>,
-) : BiConsumer<K, V> {
-    var results: ArrayList<R> = ArrayList()
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        results.add(mapper.map(k, v))
-    }
-}
-
-fun interface BiSumOf<K, V> {
-    fun map(
-        k: K,
-        v: V,
-    ): Int
-}
-
-class BiMaxOfCollector<K, V>(
-    val filter: BiFilter<K, V>,
-    val comparator: Comparator<V>,
-) : BiConsumer<K, V> {
-    var maxK: K? = null
-    var maxV: V? = null
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        if (filter.filter(k, v)) {
-            if (maxK == null || comparator.compare(v, maxV) > 0) {
-                maxK = k
-                maxV = v
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            if (filter.filter(k, v)) {
+                results.add(v)
             }
         }
     }
-}
 
-class BiSumOfCollector<K, V>(
-    val mapper: BiSumOf<K, V>,
-) : BiConsumer<K, V> {
-    var sum = 0
+    class BiFilterUniqueCollector<K, V>(
+        val filter: BiFilter<K, V>,
+    ) : BiConsumer<K, V> {
+        var results: HashSet<V> = HashSet()
 
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        sum += mapper.map(k, v)
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            if (filter.filter(k, v)) {
+                results.add(v)
+            }
+        }
     }
-}
 
-fun interface BiSumOfLong<K, V> {
-    fun map(
-        k: K,
-        v: V,
-    ): Long
-}
-
-class BiSumOfLongCollector<K, V>(
-    val mapper: BiSumOfLong<K, V>,
-) : BiConsumer<K, V> {
-    var sum = 0L
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        sum += mapper.map(k, v)
+    fun interface BiMapper<K, V, R> {
+        fun map(
+            k: K,
+            v: V,
+        ): R?
     }
-}
 
-class BiGroupByCollector<K, V, R>(
-    val mapper: BiNotNullMapper<K, V, R>,
-) : BiConsumer<K, V> {
-    var results = HashMap<R, ArrayList<V>>()
+    fun interface BiMapperNotNull<K, V, R> {
+        fun map(
+            k: K,
+            v: V,
+        ): R
+    }
 
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        val group = mapper.map(k, v)
+    class BiMapCollector<K, V, R>(
+        val mapper: BiMapper<K, V, R?>,
+    ) : BiConsumer<K, V> {
+        var results: ArrayList<R> = ArrayList()
 
-        val list = results[group]
-        if (list == null) {
-            val answer = ArrayList<V>()
-            answer.add(v)
-            results[group] = answer
-        } else {
-            list.add(v)
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val result = mapper.map(k, v)
+            if (result != null) {
+                results.add(result)
+            }
+        }
+    }
+
+    class BiAssociateCollector<K, V, T, U>(
+        val size: Int,
+        val mapper: BiMapperNotNull<K, V, Pair<T, U>>,
+    ) : BiConsumer<K, V> {
+        var results: LinkedHashMap<T, U> = LinkedHashMap(size)
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val pair = mapper.map(k, v)
+            results.put(pair.first, pair.second)
+        }
+    }
+
+    class BiAssociateNotNullCollector<K, V, T, U>(
+        val size: Int,
+        val mapper: BiMapper<K, V, Pair<T, U>?>,
+    ) : BiConsumer<K, V> {
+        var results: LinkedHashMap<T, U> = LinkedHashMap(size)
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val pair = mapper.map(k, v)
+            if (pair != null) {
+                results.put(pair.first, pair.second)
+            }
+        }
+    }
+
+    class BiAssociateWithCollector<K, V, U>(
+        val size: Int,
+        val mapper: BiMapper<K, V, U?>,
+    ) : BiConsumer<K, V> {
+        var results: LinkedHashMap<K, U?> = LinkedHashMap(size)
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            results.put(k, mapper.map(k, v))
+        }
+    }
+
+    class BiAssociateNotNullWithCollector<K, V, U>(
+        val size: Int,
+        val mapper: BiMapper<K, V, U>,
+    ) : BiConsumer<K, V> {
+        var results: LinkedHashMap<K, U> = LinkedHashMap(size)
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val newValue = mapper.map(k, v)
+            if (newValue != null) {
+                results.put(k, newValue)
+            }
+        }
+    }
+
+    class BiMapUniqueCollector<K, V, R>(
+        val mapper: BiMapper<K, V, R?>,
+    ) : BiConsumer<K, V> {
+        var results: HashSet<R> = HashSet()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val result = mapper.map(k, v)
+            if (result != null) {
+                results.add(result)
+            }
+        }
+    }
+
+    class BiMapFlattenCollector<K, V, R>(
+        val mapper: BiMapper<K, V, Collection<R>?>,
+    ) : BiConsumer<K, V> {
+        var results: ArrayList<R> = ArrayList()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val result = mapper.map(k, v)
+            if (result != null) {
+                results.addAll(result)
+            }
+        }
+    }
+
+    class BiMapFlattenUniqueCollector<K, V, R>(
+        val mapper: BiMapper<K, V, Collection<R>?>,
+    ) : BiConsumer<K, V> {
+        var results: HashSet<R> = HashSet()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val result = mapper.map(k, v)
+            if (result != null) {
+                results.addAll(result)
+            }
+        }
+    }
+
+    fun interface BiNotNullMapper<K, V, R> {
+        fun map(
+            k: K,
+            v: V,
+        ): R
+    }
+
+    class BiNotNullMapCollector<K, V, R>(
+        val mapper: BiNotNullMapper<K, V, R>,
+    ) : BiConsumer<K, V> {
+        var results: ArrayList<R> = ArrayList()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            results.add(mapper.map(k, v))
+        }
+    }
+
+    fun interface BiSumOf<K, V> {
+        fun map(
+            k: K,
+            v: V,
+        ): Int
+    }
+
+    class BiMaxOfCollector<K, V>(
+        val filter: BiFilter<K, V>,
+        val comparator: Comparator<V>,
+    ) : BiConsumer<K, V> {
+        var maxK: K? = null
+        var maxV: V? = null
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            if (filter.filter(k, v)) {
+                if (maxK == null || comparator.compare(v, maxV) > 0) {
+                    maxK = k
+                    maxV = v
+                }
+            }
+        }
+    }
+
+    class BiSumOfCollector<K, V>(
+        val mapper: BiSumOf<K, V>,
+    ) : BiConsumer<K, V> {
+        var sum = 0
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            sum += mapper.map(k, v)
+        }
+    }
+
+    fun interface BiSumOfLong<K, V> {
+        fun map(
+            k: K,
+            v: V,
+        ): Long
+    }
+
+    class BiSumOfLongCollector<K, V>(
+        val mapper: BiSumOfLong<K, V>,
+    ) : BiConsumer<K, V> {
+        var sum = 0L
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            sum += mapper.map(k, v)
+        }
+    }
+
+    class BiGroupByCollector<K, V, R>(
+        val mapper: BiNotNullMapper<K, V, R>,
+    ) : BiConsumer<K, V> {
+        var results = HashMap<R, ArrayList<V>>()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val group = mapper.map(k, v)
+
+            val list = results[group]
+            if (list == null) {
+                val answer = ArrayList<V>()
+                answer.add(v)
+                results[group] = answer
+            } else {
+                list.add(v)
+            }
+        }
+    }
+
+    class BiCountByGroupCollector<K, V, R>(
+        val mapper: BiNotNullMapper<K, V, R>,
+    ) : BiConsumer<K, V> {
+        var results = HashMap<R, Int>()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val group = mapper.map(k, v)
+
+            val count = results[group]
+            if (count == null) {
+                results[group] = 1
+            } else {
+                results[group] = count + 1
+            }
+        }
+    }
+
+    class BiSumByGroupCollector<K, V, R>(
+        val mapper: BiNotNullMapper<K, V, R>,
+        val sumOf: BiNotNullMapper<K, V, Long>,
+    ) : BiConsumer<K, V> {
+        var results = HashMap<R, Long>()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val group = mapper.map(k, v)
+
+            val sum = results[group]
+            if (sum == null) {
+                results[group] = sumOf.map(k, v)
+            } else {
+                results[group] = sum + sumOf.map(k, v)
+            }
+        }
+    }
+
+    class BiCountIfCollector<K, V>(
+        val filter: BiFilter<K, V>,
+    ) : BiConsumer<K, V> {
+        var count = 0
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            if (filter.filter(k, v)) count++
         }
     }
 }
-
-class BiCountByGroupCollector<K, V, R>(
-    val mapper: BiNotNullMapper<K, V, R>,
-) : BiConsumer<K, V> {
-    var results = HashMap<R, Int>()
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        val group = mapper.map(k, v)
-
-        val count = results[group]
-        if (count == null) {
-            results[group] = 1
-        } else {
-            results[group] = count + 1
-        }
-    }
-}
-
-class BiSumByGroupCollector<K, V, R>(
-    val mapper: BiNotNullMapper<K, V, R>,
-    val sumOf: BiNotNullMapper<K, V, Long>,
-) : BiConsumer<K, V> {
-    var results = HashMap<R, Long>()
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        val group = mapper.map(k, v)
-
-        val sum = results[group]
-        if (sum == null) {
-            results[group] = sumOf.map(k, v)
-        } else {
-            results[group] = sum + sumOf.map(k, v)
-        }
-    }
-}
-
-class BiCountIfCollector<K, V>(
-    val filter: BiFilter<K, V>,
-) : BiConsumer<K, V> {
-    var count = 0
-
-    override fun accept(
-        k: K,
-        v: V,
-    ) {
-        if (filter.filter(k, v)) count++
-    }
-}
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/utils/LargeSoftCache.kt b/quartz/src/main/java/com/vitorpamplona/quartz/utils/LargeSoftCache.kt
new file mode 100644
index 000000000..50f539bd6
--- /dev/null
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/utils/LargeSoftCache.kt
@@ -0,0 +1,627 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.utils
+
+import java.lang.ref.WeakReference
+import java.util.concurrent.ConcurrentSkipListMap
+import java.util.function.BiConsumer
+
+class LargeSoftCache<K, V> {
+    private val cache = ConcurrentSkipListMap<K, WeakReference<V>>()
+
+    fun keys() = cache.keys
+
+    fun get(key: K): V? {
+        val softRef = cache.get(key)
+        val value = softRef?.get()
+
+        return if (value != null) {
+            value
+        } else {
+            cache.remove(key)
+            null
+        }
+    }
+
+    fun remove(key: K) = cache.remove(key)
+
+    fun size() = cache.size
+
+    fun isEmpty() = cache.isEmpty()
+
+    fun clear() = cache.clear()
+
+    fun containsKey(key: K) = cache.containsKey(key)
+
+    /**
+     * Puts an object into the cache with a specified key.
+     * The object is stored as a SoftReference.
+     *
+     * @param key The key to associate with the object.
+     * @param value The object to cache.
+     */
+    fun put(
+        key: K,
+        value: V,
+    ) {
+        cache.put(key, WeakReference(value))
+    }
+
+    /**
+     * Retrieves an object from the cache using its key.
+     * Returns the object if it's still available (not garbage collected),
+     * otherwise returns null. If the object has been garbage collected,
+     * its entry is also removed from the cache.
+     *
+     * @param key The key of the object to retrieve.
+     * @return The cached object, or null if it's no longer available.
+     */
+    fun getOrCreate(
+        key: K,
+        builder: (key: K) -> V,
+    ): V {
+        val softRef = cache.get(key)
+        val value = softRef?.get()
+
+        return if (value != null) {
+            value
+        } else {
+            val newObject = builder(key)
+            cache.putIfAbsent(key, WeakReference(newObject))?.get() ?: newObject
+        }
+    }
+
+    fun createIfAbsent(
+        key: K,
+        builder: (key: K) -> V,
+    ): Boolean {
+        val softRef = cache.get(key)
+        val value = softRef?.get()
+        return if (value != null) {
+            false
+        } else {
+            val newObject = builder(key)
+            cache.putIfAbsent(key, WeakReference(newObject)) == null
+        }
+    }
+
+    /**
+     * Proactively cleans up the cache by removing entries whose weakly referenced
+     * objects have been garbage collected. While `get` handles cleanup on access,
+     * this method can be called periodically or when memory pressure is high.
+     */
+    fun cleanUp() {
+        val keysToRemove = mutableListOf<K>()
+        forEach { key, softRef ->
+            if (softRef == null) {
+                keysToRemove.add(key)
+            }
+        }
+        keysToRemove.forEach { key ->
+            cache.remove(key)
+            println("Cleaned up entry for key: $key (object was garbage collected)")
+        }
+        println("Cache cleanup completed. Remaining size: ${cache.size}")
+    }
+
+    fun forEach(consumer: BiConsumer<K, V>) {
+        innerForEach(consumer)
+    }
+
+    fun filter(consumer: BiFilter<K, V>): List<V> {
+        val runner = BiFilterCollector(consumer)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun filterIntoSet(consumer: BiFilter<K, V>): Set<V> {
+        val runner = BiFilterUniqueCollector(consumer)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun <R> map(consumer: BiNotNullMapper<K, V, R>): List<R> {
+        val runner = BiNotNullMapCollector(consumer)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun <R> mapNotNull(consumer: BiMapper<K, V, R?>): List<R> {
+        val runner = BiMapCollector(consumer)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun <R> mapNotNullIntoSet(consumer: BiMapper<K, V, R?>): Set<R> {
+        val runner = BiMapUniqueCollector(consumer)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun <R> mapFlatten(consumer: BiMapper<K, V, Collection<R>?>): List<R> {
+        val runner = BiMapFlattenCollector(consumer)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun <R> mapFlattenIntoSet(consumer: BiMapper<K, V, Collection<R>?>): Set<R> {
+        val runner = BiMapFlattenUniqueCollector(consumer)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun maxOrNullOf(
+        filter: BiFilter<K, V>,
+        comparator: Comparator<V>,
+    ): V? {
+        val runner = BiMaxOfCollector(filter, comparator)
+        innerForEach(runner)
+        return runner.maxV
+    }
+
+    fun sumOf(consumer: BiSumOf<K, V>): Int {
+        val runner = BiSumOfCollector(consumer)
+        innerForEach(runner)
+        return runner.sum
+    }
+
+    fun sumOfLong(consumer: BiSumOfLong<K, V>): Long {
+        val runner = BiSumOfLongCollector(consumer)
+        innerForEach(runner)
+        return runner.sum
+    }
+
+    fun <R> groupBy(consumer: BiNotNullMapper<K, V, R>): Map<R, List<V>> {
+        val runner = BiGroupByCollector(consumer)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun <R> countByGroup(consumer: BiNotNullMapper<K, V, R>): Map<R, Int> {
+        val runner = BiCountByGroupCollector(consumer)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun <R> sumByGroup(
+        groupMap: BiNotNullMapper<K, V, R>,
+        sumOf: BiNotNullMapper<K, V, Long>,
+    ): Map<R, Long> {
+        val runner = BiSumByGroupCollector(groupMap, sumOf)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun count(consumer: BiFilter<K, V>): Int {
+        val runner = BiCountIfCollector(consumer)
+        innerForEach(runner)
+        return runner.count
+    }
+
+    fun <T, U> associate(transform: (K, V) -> Pair<T, U>): Map<T, U> {
+        val runner = BiAssociateCollector(size(), transform)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun <T, U> associateNotNull(transform: (K, V) -> Pair<T, U>?): Map<T, U> {
+        val runner = BiAssociateNotNullCollector(size(), transform)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun <U> associateWith(transform: (K, V) -> U?): Map<K, U?> {
+        val runner = BiAssociateWithCollector(size(), transform)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    fun <U> associateNotNullWith(transform: (K, V) -> U): Map<K, U> {
+        val runner = BiAssociateNotNullWithCollector(size(), transform)
+        innerForEach(runner)
+        return runner.results
+    }
+
+    private fun innerForEach(runner: BiConsumer<K, V>) {
+        cache.forEach(BiConsumerWrapper(this, runner))
+    }
+
+    fun joinToString(
+        separator: CharSequence = ", ",
+        prefix: CharSequence = "",
+        postfix: CharSequence = "",
+        limit: Int = -1,
+        truncated: CharSequence = "...",
+        transform: ((K, V) -> CharSequence)? = null,
+    ): String {
+        val buffer = StringBuilder()
+        buffer.append(prefix)
+        var count = 0
+        forEach { key, value ->
+            val str = if (transform != null) transform(key, value) else ""
+            if (str.isNotEmpty()) {
+                if (++count > 1) buffer.append(separator)
+                if (limit < 0 || count <= limit) {
+                    when {
+                        transform != null -> buffer.append(str)
+                        else -> buffer.append("$key $value")
+                    }
+                } else {
+                    return@forEach
+                }
+            }
+        }
+        if (limit >= 0 && count > limit) buffer.append(truncated)
+        buffer.append(postfix)
+        return buffer.toString()
+    }
+
+    class BiConsumerWrapper<K, V>(
+        val cache: LargeSoftCache<K, V>,
+        val inner: BiConsumer<K, V>,
+    ) : BiConsumer<K, WeakReference<V>> {
+        override fun accept(
+            k: K,
+            ref: WeakReference<V>,
+        ) {
+            val value = ref.get()
+            if (value == null) {
+                cache.remove(k)
+            } else {
+                inner.accept(k, value)
+            }
+        }
+    }
+
+    fun interface BiFilter<K, V> {
+        fun filter(
+            k: K,
+            v: V,
+        ): Boolean
+    }
+
+    class BiFilterCollector<K, V>(
+        val filter: BiFilter<K, V>,
+    ) : BiConsumer<K, V> {
+        var results: ArrayList<V> = ArrayList()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            if (filter.filter(k, v)) {
+                results.add(v)
+            }
+        }
+    }
+
+    class BiFilterUniqueCollector<K, V>(
+        val filter: BiFilter<K, V>,
+    ) : BiConsumer<K, V> {
+        var results: HashSet<V> = HashSet()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            if (filter.filter(k, v)) {
+                results.add(v)
+            }
+        }
+    }
+
+    fun interface BiMapper<K, V, R> {
+        fun map(
+            k: K,
+            v: V,
+        ): R?
+    }
+
+    fun interface BiMapperNotNull<K, V, R> {
+        fun map(
+            k: K,
+            v: V,
+        ): R
+    }
+
+    class BiMapCollector<K, V, R>(
+        val mapper: BiMapper<K, V, R?>,
+    ) : BiConsumer<K, V> {
+        var results: ArrayList<R> = ArrayList()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val result = mapper.map(k, v)
+            if (result != null) {
+                results.add(result)
+            }
+        }
+    }
+
+    class BiAssociateCollector<K, V, T, U>(
+        val size: Int,
+        val mapper: BiMapperNotNull<K, V, Pair<T, U>>,
+    ) : BiConsumer<K, V> {
+        var results: LinkedHashMap<T, U> = LinkedHashMap(size)
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val pair = mapper.map(k, v)
+            results.put(pair.first, pair.second)
+        }
+    }
+
+    class BiAssociateNotNullCollector<K, V, T, U>(
+        val size: Int,
+        val mapper: BiMapper<K, V, Pair<T, U>?>,
+    ) : BiConsumer<K, V> {
+        var results: LinkedHashMap<T, U> = LinkedHashMap(size)
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val pair = mapper.map(k, v)
+            if (pair != null) {
+                results.put(pair.first, pair.second)
+            }
+        }
+    }
+
+    class BiAssociateWithCollector<K, V, U>(
+        val size: Int,
+        val mapper: BiMapper<K, V, U?>,
+    ) : BiConsumer<K, V> {
+        var results: LinkedHashMap<K, U?> = LinkedHashMap(size)
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            results.put(k, mapper.map(k, v))
+        }
+    }
+
+    class BiAssociateNotNullWithCollector<K, V, U>(
+        val size: Int,
+        val mapper: BiMapper<K, V, U>,
+    ) : BiConsumer<K, V> {
+        var results: LinkedHashMap<K, U> = LinkedHashMap(size)
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val newValue = mapper.map(k, v)
+            if (newValue != null) {
+                results.put(k, newValue)
+            }
+        }
+    }
+
+    class BiMapUniqueCollector<K, V, R>(
+        val mapper: BiMapper<K, V, R?>,
+    ) : BiConsumer<K, V> {
+        var results: HashSet<R> = HashSet()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val result = mapper.map(k, v)
+            if (result != null) {
+                results.add(result)
+            }
+        }
+    }
+
+    class BiMapFlattenCollector<K, V, R>(
+        val mapper: BiMapper<K, V, Collection<R>?>,
+    ) : BiConsumer<K, V> {
+        var results: ArrayList<R> = ArrayList()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val result = mapper.map(k, v)
+            if (result != null) {
+                results.addAll(result)
+            }
+        }
+    }
+
+    class BiMapFlattenUniqueCollector<K, V, R>(
+        val mapper: BiMapper<K, V, Collection<R>?>,
+    ) : BiConsumer<K, V> {
+        var results: HashSet<R> = HashSet()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val result = mapper.map(k, v)
+            if (result != null) {
+                results.addAll(result)
+            }
+        }
+    }
+
+    fun interface BiNotNullMapper<K, V, R> {
+        fun map(
+            k: K,
+            v: V,
+        ): R
+    }
+
+    class BiNotNullMapCollector<K, V, R>(
+        val mapper: BiNotNullMapper<K, V, R>,
+    ) : BiConsumer<K, V> {
+        var results: ArrayList<R> = ArrayList()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            results.add(mapper.map(k, v))
+        }
+    }
+
+    fun interface BiSumOf<K, V> {
+        fun map(
+            k: K,
+            v: V,
+        ): Int
+    }
+
+    class BiMaxOfCollector<K, V>(
+        val filter: BiFilter<K, V>,
+        val comparator: Comparator<V>,
+    ) : BiConsumer<K, V> {
+        var maxK: K? = null
+        var maxV: V? = null
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            if (filter.filter(k, v)) {
+                if (maxK == null || comparator.compare(v, maxV) > 0) {
+                    maxK = k
+                    maxV = v
+                }
+            }
+        }
+    }
+
+    class BiSumOfCollector<K, V>(
+        val mapper: BiSumOf<K, V>,
+    ) : BiConsumer<K, V> {
+        var sum = 0
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            sum += mapper.map(k, v)
+        }
+    }
+
+    fun interface BiSumOfLong<K, V> {
+        fun map(
+            k: K,
+            v: V,
+        ): Long
+    }
+
+    class BiSumOfLongCollector<K, V>(
+        val mapper: BiSumOfLong<K, V>,
+    ) : BiConsumer<K, V> {
+        var sum = 0L
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            sum += mapper.map(k, v)
+        }
+    }
+
+    class BiGroupByCollector<K, V, R>(
+        val mapper: BiNotNullMapper<K, V, R>,
+    ) : BiConsumer<K, V> {
+        var results = HashMap<R, ArrayList<V>>()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val group = mapper.map(k, v)
+
+            val list = results[group]
+            if (list == null) {
+                val answer = ArrayList<V>()
+                answer.add(v)
+                results[group] = answer
+            } else {
+                list.add(v)
+            }
+        }
+    }
+
+    class BiCountByGroupCollector<K, V, R>(
+        val mapper: BiNotNullMapper<K, V, R>,
+    ) : BiConsumer<K, V> {
+        var results = HashMap<R, Int>()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val group = mapper.map(k, v)
+
+            val count = results[group]
+            if (count == null) {
+                results[group] = 1
+            } else {
+                results[group] = count + 1
+            }
+        }
+    }
+
+    class BiSumByGroupCollector<K, V, R>(
+        val mapper: BiNotNullMapper<K, V, R>,
+        val sumOf: BiNotNullMapper<K, V, Long>,
+    ) : BiConsumer<K, V> {
+        var results = HashMap<R, Long>()
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            val group = mapper.map(k, v)
+
+            val sum = results[group]
+            if (sum == null) {
+                results[group] = sumOf.map(k, v)
+            } else {
+                results[group] = sum + sumOf.map(k, v)
+            }
+        }
+    }
+
+    class BiCountIfCollector<K, V>(
+        val filter: BiFilter<K, V>,
+    ) : BiConsumer<K, V> {
+        var count = 0
+
+        override fun accept(
+            k: K,
+            v: V,
+        ) {
+            if (filter.filter(k, v)) count++
+        }
+    }
+}