diff --git a/sandbox/src/game.ts b/sandbox/src/game.ts
index 49a7b85e..66037f3a 100644
--- a/sandbox/src/game.ts
+++ b/sandbox/src/game.ts
@@ -50,7 +50,7 @@ var game = new ex.Engine({
   displayMode: ex.DisplayMode.FitScreenAndFill,
   snapToPixel: false,
   // fixedUpdateFps: 30,
-  // pixelRatio: 2,
+  pixelRatio: 4,
   fixedUpdateFps: 60,
   maxFps: 60,
   antialiasing: {
@@ -1082,6 +1082,7 @@ var emitter = new ex.ParticleEmitter({
   pos: new ex.Vector(100, 300),
   width: 2,
   height: 2,
+  z: -10,
   particle: {
     minSpeed: 417,
     maxSpeed: 589,
@@ -1090,11 +1091,11 @@ var emitter = new ex.ParticleEmitter({
     opacity: 0.84,
     fade: true,
     life: 2465,
-    maxSize: 20.5,
-    minSize: 10,
+    maxSize: 40.5,
+    minSize: 40,
     beginColor: ex.Color.Red,
     endColor: ex.Color.Yellow,
-    graphic: blockSprite,
+    // graphic: blockSprite,
     angularVelocity: Math.PI / 10,
     acc: new ex.Vector(0, 460),
     randomRotation: true
diff --git a/src/engine/graphics/context/circle-renderer/circle-renderer.ts b/src/engine/graphics/context/circle-renderer/circle-renderer.ts
index 5faa9ac5..ffccdc09 100644
--- a/src/engine/graphics/context/circle-renderer/circle-renderer.ts
+++ b/src/engine/graphics/context/circle-renderer/circle-renderer.ts
@@ -81,6 +81,12 @@ export class CircleRenderer implements RendererPlugin {
     return false;
   }
 
+  _scratchTopLeft = vec(0, 0);
+  _scratchTopRight = vec(0, 0);
+  _scratchBottomRight = vec(0, 0);
+  _scratchBottomLeft = vec(0, 0);
+  _scratchRadius = vec(0, 0);
+
   draw(pos: Vector, radius: number, color: Color, stroke: Color = Color.Transparent, strokeThickness: number = 0): void {
     if (this._isFull()) {
       this.flush();
@@ -92,10 +98,21 @@ export class CircleRenderer implements RendererPlugin {
     const opacity = this._context.opacity;
     const snapToPixel = this._context.snapToPixel;
 
-    const topLeft = transform.multiply(pos.add(vec(-radius, -radius)));
-    const topRight = transform.multiply(pos.add(vec(radius, -radius)));
-    const bottomRight = transform.multiply(pos.add(vec(radius, radius)));
-    const bottomLeft = transform.multiply(pos.add(vec(-radius, radius)));
+    this._scratchRadius.x = -radius;
+    this._scratchRadius.y = -radius;
+    const topLeft = transform.multiply(pos.add(this._scratchRadius, this._scratchTopLeft), this._scratchTopLeft);
+
+    this._scratchRadius.x = radius;
+    this._scratchRadius.y = -radius;
+    const topRight = transform.multiply(pos.add(this._scratchRadius, this._scratchTopRight), this._scratchTopRight);
+
+    this._scratchRadius.x = radius;
+    this._scratchRadius.y = radius;
+    const bottomRight = transform.multiply(pos.add(this._scratchRadius, this._scratchBottomRight), this._scratchBottomRight);
+
+    this._scratchRadius.x = -radius;
+    this._scratchRadius.y = radius;
+    const bottomLeft = transform.multiply(pos.add(this._scratchRadius, this._scratchBottomLeft), this._scratchBottomLeft);
 
     if (snapToPixel) {
       topLeft.x = ~~(topLeft.x + pixelSnapEpsilon);
diff --git a/src/engine/particles/particles.ts b/src/engine/particles/particles.ts
index 1e9b8cd1..a6a6a4c7 100644
--- a/src/engine/particles/particles.ts
+++ b/src/engine/particles/particles.ts
@@ -121,7 +121,8 @@ export class Particle extends Entity {
       this.graphics.localBounds = BoundingBox.fromDimension(this.size, this.size, Vector.Half);
       this.graphics.onPostDraw = (ctx) => {
         ctx.save();
-        ctx.debug.drawPoint(vec(0, 0), { color: this._currentColor, size: this.size });
+        ctx.z = this.transform.z;
+        ctx.drawCircle(vec(0, 0), this.size, this._currentColor);
         ctx.restore();
       };
     }