diff --git a/tests/benchmark_masks.nim b/tests/benchmark_masks.nim
new file mode 100644
index 0000000..a359c4a
--- /dev/null
+++ b/tests/benchmark_masks.nim
@@ -0,0 +1,14 @@
+import chroma, pixie, benchy
+
+let mask = newMask(2560, 1440)
+
+proc reset() =
+  mask.fill(63)
+
+reset()
+
+timeIt "minifyBy2":
+  let minified = mask.minifyBy2()
+  doAssert minified[0, 0] == 63
+
+reset()
diff --git a/tests/images/circleMask.png b/tests/images/circleMask.png
new file mode 100644
index 0000000..89de309
Binary files /dev/null and b/tests/images/circleMask.png differ