smooth low tps

src/main/java/carpet/mixins/RenderTickCounter_tickSpeedMixin.java

@@ -0,0 +1,23 @@
+package carpet.mixins;
+
+import carpet.helpers.TickSpeed;
+import carpet.settings.CarpetSettings;
+import net.minecraft.client.render.RenderTickCounter;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+@Mixin(RenderTickCounter.class)
+public class RenderTickCounter_tickSpeedMixin {
+    @Redirect(method = "beginRenderTick", at = @At(
+            value = "FIELD",
+            target = "Lnet/minecraft/client/render/RenderTickCounter;timeScale:F"
+    ))
+    private float adjustTickSpeed(RenderTickCounter counter) {
+        if (CarpetSettings.smoothClientAnimations)
+        {
+            return Math.max(50.0f, TickSpeed.mspt);
+        }
+        return 50f;
+    }
+}

src/main/java/carpet/settings/CarpetSettings.java

@@ -223,6 +223,9 @@ public class CarpetSettings
     @Rule(desc = "fill/clone/setblock and structure blocks cause block updates", category = CREATIVE)
     public static boolean fillUpdates = true;
 
+    @Rule(desc = "smooth client animations with low tps settings", extra = "works only in SP, and will slow down players", category = CREATIVE)
+    public static boolean smoothClientAnimations;
+
     private static class PushLimitLimits extends Validator<Integer> {
         @Override public Integer validate(ServerCommandSource source, ParsedRule<Integer> currentRule, Integer newValue, String string) {
             return (newValue>0 && newValue <= 1024) ? newValue : null;

src/main/resources/carpet.mixins.json

@@ -113,6 +113,7 @@
     "WorldChunk_movableTEMixin"
   ],
   "client": [
+    "RenderTickCounter_tickSpeedMixin",
     "MinecraftClientMixin",
     "IntegratedServerMixin",
     "InGameHudMixin",