Memoize VanillaRegistres.createLookup

Author: embeddedt

common/src/main/java/org/embeddedt/modernfix/common/mixin/perf/compact_mojang_registries/VanillaRegistriesMixin.java

@@ -0,0 +1,22 @@
+package org.embeddedt.modernfix.common.mixin.perf.compact_mojang_registries;
+
+import com.llamalad7.mixinextras.injector.wrapmethod.WrapMethod;
+import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
+import net.minecraft.core.HolderLookup;
+import net.minecraft.data.registries.VanillaRegistries;
+import org.spongepowered.asm.mixin.Mixin;
+
+@Mixin(VanillaRegistries.class)
+public class VanillaRegistriesMixin {
+    private static HolderLookup.Provider STATIC_PROVIDER;
+
+    @WrapMethod(method = "createLookup")
+    private static HolderLookup.Provider modernfix$memoizeLookup(Operation<HolderLookup.Provider> original) {
+        synchronized (VanillaRegistries.class) {
+            if (STATIC_PROVIDER == null) {
+                STATIC_PROVIDER = original.call();
+            }
+            return STATIC_PROVIDER;
+        }
+    }
+}