Actually just after 1 region is generated switch

src/main/java/com/volmit/iris/core/pregenerator/IrisPregenerator.java

@@ -111,7 +111,7 @@ public class IrisPregenerator {
     }
 
     private long computeETA() {
-        return (long) ((generated.get() > totalChunks.get() >> 3) ? // Generated chunks exceed 1/8th of total?
+        return (long) (totalChunks.get() > 1024 ? // Generated chunks exceed 1/8th of total?
                 // If yes, use smooth function (which gets more accurate over time since its less sensitive to outliers)
                 ((totalChunks.get() - generated.get()) * ((double) (M.ms() - startTime.get()) / (double) generated.get())) :
                 // If no, use quick function (which is less accurate over time but responds better to the initial delay)