Use hit object pooling for Droplet and TinyDroplet.

osu.Game.Rulesets.Catch/Objects/Drawables/DrawableDroplet.cs

@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using JetBrains.Annotations;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Utils;
@@ -13,7 +14,12 @@ namespace osu.Game.Rulesets.Catch.Objects.Drawables
     {
         public override bool StaysOnPlate => false;
 
-        public DrawableDroplet(CatchHitObject h)
+        public DrawableDroplet()
+            : this(null)
+        {
+        }
+
+        public DrawableDroplet([CanBeNull] CatchHitObject h)
             : base(h)
         {
         }

osu.Game.Rulesets.Catch/Objects/Drawables/DrawableTinyDroplet.cs

@@ -1,13 +1,20 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using JetBrains.Annotations;
+
 namespace osu.Game.Rulesets.Catch.Objects.Drawables
 {
     public class DrawableTinyDroplet : DrawableDroplet
     {
         protected override float ScaleFactor => base.ScaleFactor / 2;
 
-        public DrawableTinyDroplet(TinyDroplet h)
+        public DrawableTinyDroplet()
+            : this(null)
+        {
+        }
+
+        public DrawableTinyDroplet([CanBeNull] TinyDroplet h)
             : base(h)
         {
         }

osu.Game.Rulesets.Catch/UI/CatchPlayfield.cs

@@ -2,6 +2,7 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
+using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Game.Beatmaps;
@@ -56,6 +57,13 @@ namespace osu.Game.Rulesets.Catch.UI
             };
         }
 
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            RegisterPool<Droplet, DrawableDroplet>(1);
+            RegisterPool<TinyDroplet, DrawableTinyDroplet>(1);
+        }
+
         protected override void LoadComplete()
         {
             base.LoadComplete();

osu.Game.Rulesets.Catch/UI/DrawableCatchRuleset.cs

@@ -55,12 +55,6 @@ namespace osu.Game.Rulesets.Catch.UI
 
                 case BananaShower shower:
                     return new DrawableBananaShower(shower, CreateDrawableRepresentation);
-
-                case TinyDroplet tiny:
-                    return new DrawableTinyDroplet(tiny);
-
-                case Droplet droplet:
-                    return new DrawableDroplet(droplet);
             }
 
             return null;