diff --git a/src/main/java/org/embeddedt/modernfix/core/config/ModernFixEarlyConfig.java b/src/main/java/org/embeddedt/modernfix/core/config/ModernFixEarlyConfig.java
index c9a24ba7..6acb7e85 100644
--- a/src/main/java/org/embeddedt/modernfix/core/config/ModernFixEarlyConfig.java
+++ b/src/main/java/org/embeddedt/modernfix/core/config/ModernFixEarlyConfig.java
@@ -29,7 +29,7 @@ public class ModernFixEarlyConfig {
         this.addMixinRule("bugfix.edge_chunk_not_saved", true);
         this.addMixinRule("perf.async_jei", true);
         this.addMixinRule("perf.thread_priorities", true);
-        this.addMixinRule("perf.preload_block_classes", true);
+        this.addMixinRule("perf.preload_block_classes", false);
         this.addMixinRule("perf.parallel_potentially_unsafe", false);
         this.addMixinRule("perf.parallel_blockstate_cache_rebuild", true);
         this.addMixinRule("safety", true);