diff --git a/tests/Signal/wrapper.test.ts b/tests/Signal/wrapper.test.ts
new file mode 100644
index 0000000..24d0813
--- /dev/null
+++ b/tests/Signal/wrapper.test.ts
@@ -0,0 +1,38 @@
+import {describe, expect, it} from 'vitest';
+import {Signal} from '../../src/wrapper.js';
+
+describe('Performance', () => {
+  it('per-item unwatch is fast', () => {
+    const amountOfSignals = 10000;
+    const unwatchToWatchSlownessRatio = 35;
+    const w = new Signal.subtle.Watcher(() => {});
+    const signals = Array.from({length: amountOfSignals}, () => new Signal.State(1));
+    const watchStart = performance.now();
+    signals.forEach((s) => w.watch(s));
+    const watchEnd = performance.now();
+    const unwatchStart = performance.now();
+    signals.forEach((s) => w.unwatch(s));
+    const unwatchEnd = performance.now();
+    const watchTime = watchEnd - watchStart;
+    const unwatchTime = unwatchEnd - unwatchStart;
+
+    // we assume that unwatch can't be N times slower than watch
+    expect(unwatchTime).toBeLessThan(watchTime * unwatchToWatchSlownessRatio);
+  });
+  it('batch unwatch is fast', () => {
+    const amountOfSignals = 10000;
+    const unwatchToWatchSlownessRatio = 4;
+    const w = new Signal.subtle.Watcher(() => {});
+    const signals = Array.from({length: amountOfSignals}, () => new Signal.State(1));
+    const watchStart = performance.now();
+    signals.forEach((s) => w.watch(s));
+    const watchEnd = performance.now();
+    const unwatchStart = performance.now();
+    w.unwatch(...signals);
+    const unwatchEnd = performance.now();
+    const watchTime = watchEnd - watchStart;
+    const unwatchTime = unwatchEnd - unwatchStart;
+
+    expect(unwatchTime).toBeLessThan(watchTime * unwatchToWatchSlownessRatio);
+  });
+});