smth like this

core/src/main/java/com/volmit/iris/core/IrisSettings.java

@@ -141,6 +141,7 @@ public class IrisSettings {
         public int resourceLoaderCacheSize = 1_024;
         public int objectLoaderCacheSize = 4_096;
         public int scriptLoaderCacheSize = 512;
+        public int tectonicUnloadThreads = 1;
         public boolean dynamicPerformanceMode = true;
     }
 

core/src/main/java/com/volmit/iris/util/mantle/Mantle.java

@@ -470,8 +470,7 @@ public class Mantle {
             }
              */
 
-            int numThreads = 1; // Specify the number of threads you want
-            BurstExecutor burstExecutor = new BurstExecutor(Executors.newFixedThreadPool(numThreads), toUnload.size());
+            BurstExecutor burstExecutor = new BurstExecutor(Executors.newFixedThreadPool(IrisSettings.get().getPerformance().tectonicUnloadThreads), toUnload.size());
 
 
             for (Long i : toUnload) {