diff --git a/CHANGELOG.md b/CHANGELOG.md
index 732944acf..83f0c3229 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -213,6 +213,7 @@ are doing mtv adjustments during precollision.
 
 ### Updates
 
+- Perf improve PolygonCollider.contains(...) perf by keeping geometry tests in local space.
 - Perf improvement to image rendering! with ImageRendererV2! Roughly doubles the performance of image rendering
 - Perf improvement to retrieving components with `ex.Entity.get()` which widely improves engine performance
 - Non-breaking parameters that reference `delta` to `elapsedMs` to better communicate intent and units
diff --git a/src/engine/Collision/Colliders/PolygonCollider.ts b/src/engine/Collision/Colliders/PolygonCollider.ts
index 91167064b..caae1cc5f 100644
--- a/src/engine/Collision/Colliders/PolygonCollider.ts
+++ b/src/engine/Collision/Colliders/PolygonCollider.ts
@@ -524,13 +524,17 @@ export class PolygonCollider extends Collider {
   public contains(point: Vector): boolean {
     // Always cast to the right, as long as we cast in a consistent fixed direction we
     // will be fine
-    const testRay = new Ray(point, new Vector(1, 0));
-    const intersectCount = this.getSides().reduce(function (accum, side) {
+    const localPoint = this._transform.applyInverse(point);
+    const testRay = new Ray(localPoint, new Vector(1, 0));
+
+    let intersectCount = 0;
+    const sides = this.getLocalSides();
+    for (let sideIndex = 0; sideIndex < sides.length; sideIndex++) {
+      const side = sides[sideIndex];
       if (testRay.intersect(side) >= 0) {
-        return accum + 1;
+        intersectCount++;
       }
-      return accum;
-    }, 0);
+    }
 
     if (intersectCount % 2 === 0) {
       return false;