diff --git a/tests/manual/matchall-bench.js b/tests/manual/matchall-bench.js
new file mode 100644
index 0000000..4990287
--- /dev/null
+++ b/tests/manual/matchall-bench.js
@@ -0,0 +1,16 @@
+'use strict';
+
+const RE2 = require('../../re2');
+
+const N = 1_000_000;
+
+const s = 'a'.repeat(N),
+  re = new RE2('a', 'g'),
+  matches = s.matchAll(re);
+
+let n = 0;
+for (const _ of matches) ++n;
+
+if (n !== s.length) console.log('Wrong result.');
+
+console.log('Done.');