minor edits

src/net/torvald/terrarum/concurrent/ThreadParallel.kt

@@ -17,7 +17,7 @@ object ThreadExecutor {
     private fun checkShutdown() {
         if (!executor.isShutdown) return
         if (executor.isShutdown&& !executor.isTerminated)
-            throw IllegalStateException("Thread pool is still running")
+            throw IllegalStateException("Pool is closed, come back when all the threads are terminated.")
 
         executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors())
     }

src/net/torvald/terrarum/modulebasegame/WorldgenLoadScreen.kt

@@ -21,6 +21,7 @@ class WorldgenLoadScreen(private val world: GameWorld, screenToBeLoaded: IngameI
 
     companion object {
         private const val WIDTH_RATIO = 0.6
+        private const val PREVIEW_UPDATE_RATE = 1/8f
     }
 
     private val previewWidth = (AppLoader.screenW * WIDTH_RATIO).roundToInt()