diff --git a/src/net/torvald/terrarum/audio/audiobank/MusicContainer.kt b/src/net/torvald/terrarum/audio/audiobank/MusicContainer.kt
index c17a95f08..3ff4301b4 100644
--- a/src/net/torvald/terrarum/audio/audiobank/MusicContainer.kt
+++ b/src/net/torvald/terrarum/audio/audiobank/MusicContainer.kt
@@ -140,7 +140,7 @@ class MusicContainer(
                 gdxMusic.forceInvoke<Int>("read", arrayOf(readBuf))!!.toLong() // its return value will be useless for looping=true
                 val read = minOf(readSize.toLong(), (totalSizeInBytes - readCount))
 
-                UnsafeHelper.memcpyRaw(readBuf, UnsafeHelper.getArrayOffset(readBuf), null, soundBuf!!.ptr + readCount, read)
+                UnsafeHelper.memcpyFromArrToPtr(readBuf, 0, soundBuf!!.ptr + readCount, read)
 
                 readCount += read
 
diff --git a/src/net/torvald/terrarum/gameactors/ActorWithBody.kt b/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
index e956a7319..61ea48d1a 100644
--- a/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
+++ b/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
@@ -401,6 +401,22 @@ open class ActorWithBody : Actor {
     private var stairPenaltyCounter = 0 // unit: update count. 1 second is roughly 64 updates.
     private var stairPenaltyVector = 1.0
 
+
+    /**
+     * 0: None
+     * 1: 1x1
+     * 2: 3x3
+     * 3: 5x5
+     * ...
+     * n: (2n-1)x(2n-1)
+     */
+    @Transient val chunkAnchorRange: Int = 0
+
+    /**
+     * Should nearby chunks be kept in the chunk pool even if the player is far away.
+     */
+    @Transient var chunkAnchoring = false
+
     init {
         // some initialiser goes here...
     }
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureAlloyingFurnace.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureAlloyingFurnace.kt
index 9fb1cb1fd..c3f3f5562 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureAlloyingFurnace.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureAlloyingFurnace.kt
@@ -378,6 +378,8 @@ class FixtureAlloyingFurnace : FixtureBase {
             }
         }
 
+        inOperation = (temperature > 0.001f)
+        chunkAnchoring = inOperation // update immediately instead of waiting for the next update
     }
 
     @Transient private val filterIndex = 0
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureBase.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureBase.kt
index 7977eccd2..3cd3db7de 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureBase.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureBase.kt
@@ -47,6 +47,8 @@ open class FixtureBase : ActorWithBody, CuedByTerrainChange {
     @Transient var mainUI: UICanvas? = null
     var inventory: FixtureInventory? = null
 
+    @Transient var inOperation = false
+
 //    @Transient var mainUIopenFun: ((UICanvas) -> Unit)? = null
 
     internal var actorThatInstalledThisFixture: UUID? = null
@@ -424,6 +426,7 @@ open class FixtureBase : ActorWithBody, CuedByTerrainChange {
      */
     override fun updateImpl(delta: Float) {
         super.updateImpl(delta)
+        chunkAnchoring = inOperation
     }
 
     /**
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureJukebox.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureJukebox.kt
index a5ae350f1..7888bd76b 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureJukebox.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureJukebox.kt
@@ -101,6 +101,7 @@ class FixtureJukebox : Electric, PlaysMusic {
         get() = discInventory.isEmpty()
 
     override fun updateImpl(delta: Float) {
+        inOperation = musicIsPlaying
         super.updateImpl(delta)
     }
 
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureMusicalTurntable.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureMusicalTurntable.kt
index 47f2c8416..ef886ed76 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureMusicalTurntable.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureMusicalTurntable.kt
@@ -90,6 +90,7 @@ class FixtureMusicalTurntable : Electric, PlaysMusic {
     }
 
     override fun updateImpl(delta: Float) {
+        inOperation = musicIsPlaying
         super.updateImpl(delta)
     }
 
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureSmelterBasic.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureSmelterBasic.kt
index d58689922..489780218 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureSmelterBasic.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureSmelterBasic.kt
@@ -365,6 +365,8 @@ class FixtureSmelterBasic : FixtureBase {
             }
         }
 
+        inOperation = (temperature > 0.001f)
+        chunkAnchoring = inOperation // update immediately instead of waiting for the next update
     }
 
     @Transient private val filterIndex = 0