diff --git a/buildSrc/src/main/groovy/modernfix.mod-common-conventions.gradle b/buildSrc/src/main/groovy/modernfix.mod-common-conventions.gradle
index dc9f149b..8cb7a916 100644
--- a/buildSrc/src/main/groovy/modernfix.mod-common-conventions.gradle
+++ b/buildSrc/src/main/groovy/modernfix.mod-common-conventions.gradle
@@ -7,7 +7,7 @@ loom {
     silentMojangMappingsLicense()
     accessWidenerPath = file("${rootDir}/common/src/main/resources/modernfix.accesswidener")
     mixin {
-        useLegacyMixinAp = false
+        useLegacyMixinAp = true
     }
 }
 
diff --git a/common/src/main/java/org/embeddedt/modernfix/core/config/ModernFixEarlyConfig.java b/common/src/main/java/org/embeddedt/modernfix/core/config/ModernFixEarlyConfig.java
index 20b5ffe1..80810af4 100644
--- a/common/src/main/java/org/embeddedt/modernfix/core/config/ModernFixEarlyConfig.java
+++ b/common/src/main/java/org/embeddedt/modernfix/core/config/ModernFixEarlyConfig.java
@@ -165,6 +165,7 @@ public class ModernFixEarlyConfig {
             .put("mixin.feature.stalled_chunk_load_detection", false)
             .put("mixin.perf.blast_search_trees.force", false)
             .put("mixin.bugfix.restore_old_dragon_movement", false)
+            .put("mixin.perf.worldgen_allocation", false) // experimental
             .put("mixin.feature.cause_lag_by_disabling_threads", false)
             .put("mixin.perf.clear_mixin_classinfo", false)
             .put("mixin.perf.deduplicate_climate_parameters", false)