Only recompute the composite race when neccessary

src/main/java/com/minelittlepony/unicopia/Race.java

@@ -2,12 +2,14 @@ package com.minelittlepony.unicopia;
 
 import java.util.*;
 import java.util.function.Predicate;
+import java.util.function.Supplier;
 import java.util.stream.Collectors;
 
 import org.jetbrains.annotations.Nullable;
 import org.spongepowered.include.com.google.common.base.Objects;
 
 import com.google.common.base.Strings;
+import com.google.common.base.Suppliers;
 import com.minelittlepony.unicopia.ability.magic.Affine;
 import com.minelittlepony.unicopia.util.RegistryUtils;
 import com.mojang.brigadier.context.CommandContext;
@@ -22,7 +24,7 @@ import net.minecraft.util.Identifier;
 import net.minecraft.registry.Registry;
 import net.minecraft.registry.RegistryKey;
 
-public record Race (boolean canCast, FlightType flightType, boolean canUseEarth, boolean isNocturnal, boolean canHang) implements Affine {
+public record Race (Supplier<Composite> compositeSupplier, boolean canCast, FlightType flightType, boolean canUseEarth, boolean isNocturnal, boolean canHang) implements Affine {
     public static final String DEFAULT_ID = "unicopia:unset";
     public static final Registry<Race> REGISTRY = RegistryUtils.createDefaulted(Unicopia.id("race"), DEFAULT_ID);
     public static final RegistryKey<? extends Registry<Race>> REGISTRY_KEY = REGISTRY.getKey();
@@ -33,7 +35,7 @@ public record Race (boolean canCast, FlightType flightType, boolean canUseEarth,
     }
 
     public static Race register(Identifier id, boolean magic, FlightType flight, boolean earth, boolean nocturnal, boolean canHang) {
-        return Registry.register(REGISTRY, id, new Race(magic, flight, earth, nocturnal, canHang));
+        return Registry.register(REGISTRY, id, new Race(Suppliers.memoize(() -> new Composite(REGISTRY.get(id), null)), magic, flight, earth, nocturnal, canHang));
     }
 
     public static RegistryKeyArgumentType<Race> argument() {
@@ -55,6 +57,14 @@ public record Race (boolean canCast, FlightType flightType, boolean canUseEarth,
 
     public static void bootstrap() {}
 
+    public Composite composite() {
+        return compositeSupplier.get();
+    }
+
+    public Composite composite(@Nullable Race pseudo) {
+        return pseudo == null ? composite() : new Composite(this, pseudo);
+    }
+
     @Override
     public Affinity getAffinity() {
         return this == CHANGELING ? Affinity.BAD : Affinity.NEUTRAL;
@@ -187,8 +197,6 @@ public record Race (boolean canCast, FlightType flightType, boolean canUseEarth,
     }
 
     public record Composite (Race physical, @Nullable Race pseudo) {
-        public static Composite DEFAULT = new Composite(Race.HUMAN, null);
-
         public Race collapsed() {
             return pseudo == null ? physical : pseudo;
         }

src/main/java/com/minelittlepony/unicopia/Unicopia.java

@@ -104,7 +104,7 @@ public class Unicopia implements ModInitializer {
         Optional<Pony> getPony();
 
         default Race.Composite getPlayerSpecies() {
-            return getPony().map(Pony::getCompositeRace).orElse(Race.Composite.DEFAULT);
+            return getPony().map(Pony::getCompositeRace).orElse(Race.HUMAN.composite());
         }
     }
 }

src/main/java/com/minelittlepony/unicopia/entity/Equine.java

@@ -21,7 +21,7 @@ public interface Equine<T extends Entity> extends NbtSerialisable, Tickable, Pro
     void setSpecies(Race race);
 
     default Race.Composite getCompositeRace() {
-        return new Race.Composite(getSpecies(), null);
+        return getSpecies().composite();
     }
 
     /**

src/main/java/com/minelittlepony/unicopia/entity/player/Pony.java

@@ -94,6 +94,8 @@ public class Pony extends Living<PlayerEntity> implements Copyable<Pony>, Update
 
     private final Interpolator interpolator = new LinearInterpolator();
 
+    @Nullable
+    private Race.Composite compositeRace;
     private Race respawnRace = Race.UNSET;
 
     private boolean dirty;
@@ -203,13 +205,7 @@ public class Pony extends Living<PlayerEntity> implements Copyable<Pony>, Update
      * This includes illusions and shape-shifting but excludes items that grant abilities without changing their race.
      */
     public Race getObservedSpecies() {
-        return getSpellSlot()
-                .get(SpellPredicate.IS_MIMIC, true)
-                .map(AbstractDisguiseSpell::getDisguise)
-                .map(EntityAppearance::getAppearance)
-                .flatMap(Pony::of)
-                .map(Pony::getSpecies)
-                .orElseGet(this::getSpecies);
+        return getCompositeRace().physical();
     }
 
     /**
@@ -218,12 +214,21 @@ public class Pony extends Living<PlayerEntity> implements Copyable<Pony>, Update
      */
     @Override
     public Race.Composite getCompositeRace() {
-        return new Race.Composite(getObservedSpecies(),
+        if (compositeRace == null || entity.age % 2 == 0) {
+            compositeRace = getSpellSlot()
+                    .get(SpellPredicate.IS_MIMIC, true)
+                    .map(AbstractDisguiseSpell::getDisguise)
+                    .map(EntityAppearance::getAppearance)
+                    .flatMap(Pony::of)
+                    .map(Pony::getSpecies)
+                    .orElseGet(this::getSpecies).composite(
                   AmuletSelectors.UNICORN_AMULET.test(entity) ? Race.UNICORN
                 : AmuletSelectors.ALICORN_AMULET.test(entity) ? Race.ALICORN
                 : null
             );
         }
+        return compositeRace;
+    }
 
     @Override
     public void setSpecies(Race race) {