diff --git a/bench/snippets/spread-set.mjs b/bench/snippets/spread-set.mjs
new file mode 100644
index 0000000000..2b150fe986
--- /dev/null
+++ b/bench/snippets/spread-set.mjs
@@ -0,0 +1,20 @@
+// Benchmark for [...set] optimization (WebKit#56539)
+// https://github.com/WebKit/WebKit/pull/56539
+import { bench, run } from "../runner.mjs";
+
+const intSet10 = new Set([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
+const intSet100 = new Set(Array.from({ length: 100 }, (_, i) => i));
+const strSet10 = new Set(Array.from({ length: 10 }, (_, i) => `key-${i}`));
+const strSet100 = new Set(Array.from({ length: 100 }, (_, i) => `key-${i}`));
+
+const objSet10 = new Set(Array.from({ length: 10 }, (_, i) => ({ id: i })));
+const objSet100 = new Set(Array.from({ length: 100 }, (_, i) => ({ id: i })));
+
+bench("[...set] - integers (10)", () => [...intSet10]);
+bench("[...set] - integers (100)", () => [...intSet100]);
+bench("[...set] - strings (10)", () => [...strSet10]);
+bench("[...set] - strings (100)", () => [...strSet100]);
+bench("[...set] - objects (10)", () => [...objSet10]);
+bench("[...set] - objects (100)", () => [...objSet100]);
+
+await run();