diff --git a/osu.Game.Rulesets.Mania/Edit/Blueprints/HoldNotePlacementBlueprint.cs b/osu.Game.Rulesets.Mania/Edit/Blueprints/HoldNotePlacementBlueprint.cs
index b3dd392202..c63e30e98a 100644
--- a/osu.Game.Rulesets.Mania/Edit/Blueprints/HoldNotePlacementBlueprint.cs
+++ b/osu.Game.Rulesets.Mania/Edit/Blueprints/HoldNotePlacementBlueprint.cs
@@ -7,6 +7,7 @@ using osu.Framework.Input.Events;
 using osu.Game.Rulesets.Mania.Edit.Blueprints.Components;
 using osu.Game.Rulesets.Mania.Objects;
 using osuTK;
+using osuTK.Input;
 
 namespace osu.Game.Rulesets.Mania.Edit.Blueprints
 {
@@ -49,6 +50,9 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
 
         protected override void OnMouseUp(MouseUpEvent e)
         {
+            if (e.Button != MouseButton.Left)
+                return;
+
             base.OnMouseUp(e);
             EndPlacement(true);
         }
diff --git a/osu.Game.Rulesets.Mania/Edit/Blueprints/ManiaPlacementBlueprint.cs b/osu.Game.Rulesets.Mania/Edit/Blueprints/ManiaPlacementBlueprint.cs
index 400abb6380..3fb03d642f 100644
--- a/osu.Game.Rulesets.Mania/Edit/Blueprints/ManiaPlacementBlueprint.cs
+++ b/osu.Game.Rulesets.Mania/Edit/Blueprints/ManiaPlacementBlueprint.cs
@@ -11,6 +11,7 @@ using osu.Game.Rulesets.Mania.Objects.Drawables.Pieces;
 using osu.Game.Rulesets.Mania.UI;
 using osu.Game.Rulesets.UI.Scrolling;
 using osuTK;
+using osuTK.Input;
 
 namespace osu.Game.Rulesets.Mania.Edit.Blueprints
 {
@@ -46,6 +47,9 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
 
         protected override bool OnMouseDown(MouseDownEvent e)
         {
+            if (e.Button != MouseButton.Left)
+                return false;
+
             if (Column == null)
                 return base.OnMouseDown(e);
 
diff --git a/osu.Game.Rulesets.Mania/Edit/Blueprints/NotePlacementBlueprint.cs b/osu.Game.Rulesets.Mania/Edit/Blueprints/NotePlacementBlueprint.cs
index 2b7b383dbe..a4c0791253 100644
--- a/osu.Game.Rulesets.Mania/Edit/Blueprints/NotePlacementBlueprint.cs
+++ b/osu.Game.Rulesets.Mania/Edit/Blueprints/NotePlacementBlueprint.cs
@@ -5,6 +5,7 @@ using osu.Framework.Graphics;
 using osu.Framework.Input.Events;
 using osu.Game.Rulesets.Mania.Edit.Blueprints.Components;
 using osu.Game.Rulesets.Mania.Objects;
+using osuTK.Input;
 
 namespace osu.Game.Rulesets.Mania.Edit.Blueprints
 {
@@ -30,6 +31,9 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
 
         protected override bool OnMouseDown(MouseDownEvent e)
         {
+            if (e.Button != MouseButton.Left)
+                return false;
+
             base.OnMouseDown(e);
 
             // Place the note immediately.
diff --git a/osu.Game/IO/Serialization/Converters/TypedListConverter.cs b/osu.Game/IO/Serialization/Converters/TypedListConverter.cs
index 64f1ebeb1a..f98fa05821 100644
--- a/osu.Game/IO/Serialization/Converters/TypedListConverter.cs
+++ b/osu.Game/IO/Serialization/Converters/TypedListConverter.cs
@@ -9,12 +9,12 @@ using Newtonsoft.Json.Linq;
 namespace osu.Game.IO.Serialization.Converters
 {
     /// <summary>
-    /// A type of <see cref="JsonConverter"/> that serializes a <see cref="List{T}"/> alongside
+    /// A type of <see cref="JsonConverter"/> that serializes an <see cref="IReadOnlyList{T}"/> alongside
     /// a lookup table for the types contained. The lookup table is used in deserialization to
     /// reconstruct the objects with their original types.
     /// </summary>
-    /// <typeparam name="T">The type of objects contained in the <see cref="List{T}"/> this attribute is attached to.</typeparam>
-    public class TypedListConverter<T> : JsonConverter
+    /// <typeparam name="T">The type of objects contained in the <see cref="IReadOnlyList{T}"/> this attribute is attached to.</typeparam>
+    public class TypedListConverter<T> : JsonConverter<IReadOnlyList<T>>
     {
         private readonly bool requiresTypeVersion;
 
@@ -36,9 +36,7 @@ namespace osu.Game.IO.Serialization.Converters
             this.requiresTypeVersion = requiresTypeVersion;
         }
 
-        public override bool CanConvert(Type objectType) => objectType == typeof(List<T>);
-
-        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        public override IReadOnlyList<T> ReadJson(JsonReader reader, Type objectType, IReadOnlyList<T> existingValue, bool hasExistingValue, JsonSerializer serializer)
         {
             var list = new List<T>();
 
@@ -59,14 +57,12 @@ namespace osu.Game.IO.Serialization.Converters
             return list;
         }
 
-        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        public override void WriteJson(JsonWriter writer, IReadOnlyList<T> value, JsonSerializer serializer)
         {
-            var list = (IEnumerable<T>)value;
-
             var lookupTable = new List<string>();
             var objects = new List<JObject>();
 
-            foreach (var item in list)
+            foreach (var item in value)
             {
                 var type = item.GetType();
                 var assemblyName = type.Assembly.GetName();
diff --git a/osu.Game/IO/Serialization/Converters/Vector2Converter.cs b/osu.Game/IO/Serialization/Converters/Vector2Converter.cs
index bf5edeef94..46447b607b 100644
--- a/osu.Game/IO/Serialization/Converters/Vector2Converter.cs
+++ b/osu.Game/IO/Serialization/Converters/Vector2Converter.cs
@@ -11,26 +11,22 @@ namespace osu.Game.IO.Serialization.Converters
     /// <summary>
     /// A type of <see cref="JsonConverter"/> that serializes only the X and Y coordinates of a <see cref="Vector2"/>.
     /// </summary>
-    public class Vector2Converter : JsonConverter
+    public class Vector2Converter : JsonConverter<Vector2>
     {
-        public override bool CanConvert(Type objectType) => objectType == typeof(Vector2);
-
-        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        public override Vector2 ReadJson(JsonReader reader, Type objectType, Vector2 existingValue, bool hasExistingValue, JsonSerializer serializer)
         {
             var obj = JObject.Load(reader);
             return new Vector2((float)obj["x"], (float)obj["y"]);
         }
 
-        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        public override void WriteJson(JsonWriter writer, Vector2 value, JsonSerializer serializer)
         {
-            var vector = (Vector2)value;
-
             writer.WriteStartObject();
 
             writer.WritePropertyName("x");
-            writer.WriteValue(vector.X);
+            writer.WriteValue(value.X);
             writer.WritePropertyName("y");
-            writer.WriteValue(vector.Y);
+            writer.WriteValue(value.Y);
 
             writer.WriteEndObject();
         }
diff --git a/osu.Game/OsuGame.cs b/osu.Game/OsuGame.cs
index 3caffb6db5..7ecd7851d7 100644
--- a/osu.Game/OsuGame.cs
+++ b/osu.Game/OsuGame.cs
@@ -91,7 +91,7 @@ namespace osu.Game
 
         protected BackButton BackButton;
 
-        protected SettingsPanel Settings;
+        protected SettingsOverlay Settings;
 
         private VolumeOverlay volume;
         private OsuLogo osuLogo;
@@ -767,13 +767,20 @@ namespace osu.Game
 
         private Task asyncLoadStream;
 
-        private T loadComponentSingleFile<T>(T d, Action<T> add, bool cache = false)
+        /// <summary>
+        /// Queues loading the provided component in sequential fashion.
+        /// This operation is limited to a single thread to avoid saturating all cores.
+        /// </summary>
+        /// <param name="component">The component to load.</param>
+        /// <param name="loadCompleteAction">An action to invoke on load completion (generally to add the component to the hierarchy).</param>
+        /// <param name="cache">Whether to cache the component as type <typeparamref name="T"/> into the game dependencies before any scheduling.</param>
+        private T loadComponentSingleFile<T>(T component, Action<T> loadCompleteAction, bool cache = false)
             where T : Drawable
         {
             if (cache)
-                dependencies.Cache(d);
+                dependencies.CacheAs(component);
 
-            if (d is OverlayContainer overlay)
+            if (component is OverlayContainer overlay)
                 overlays.Add(overlay);
 
             // schedule is here to ensure that all component loads are done after LoadComplete is run (and thus all dependencies are cached).
@@ -791,12 +798,12 @@ namespace osu.Game
 
                     try
                     {
-                        Logger.Log($"Loading {d}...", level: LogLevel.Debug);
+                        Logger.Log($"Loading {component}...", level: LogLevel.Debug);
 
                         // Since this is running in a separate thread, it is possible for OsuGame to be disposed after LoadComponentAsync has been called
                         // throwing an exception. To avoid this, the call is scheduled on the update thread, which does not run if IsDisposed = true
                         Task task = null;
-                        var del = new ScheduledDelegate(() => task = LoadComponentAsync(d, add));
+                        var del = new ScheduledDelegate(() => task = LoadComponentAsync(component, loadCompleteAction));
                         Scheduler.Add(del);
 
                         // The delegate won't complete if OsuGame has been disposed in the meantime
@@ -811,7 +818,7 @@ namespace osu.Game
 
                         await task;
 
-                        Logger.Log($"Loaded {d}!", level: LogLevel.Debug);
+                        Logger.Log($"Loaded {component}!", level: LogLevel.Debug);
                     }
                     catch (OperationCanceledException)
                     {
@@ -819,7 +826,7 @@ namespace osu.Game
                 });
             });
 
-            return d;
+            return component;
         }
 
         protected override bool OnScroll(ScrollEvent e)