diff --git a/benchmark/path/toNamespacedPath-posix.js b/benchmark/path/toNamespacedPath-posix.js
new file mode 100644
index 00000000000000..dbef737dc8ee84
--- /dev/null
+++ b/benchmark/path/toNamespacedPath-posix.js
@@ -0,0 +1,26 @@
+'use strict';
+const common = require('../common.js');
+const { posix } = require('path');
+const assert = require('assert');
+
+const bench = common.createBenchmark(main, {
+  path: [
+    '',
+    '.',
+    '/tmp/bar',
+    '/home/node/..',
+    posix.join(__dirname, '/..'),
+    'bar/baz',
+  ],
+  n: [1e5],
+});
+
+function main({ n, path }) {
+  bench.start();
+  let a;
+  for (let i = 0; i < n; i++) {
+    a = posix.toNamespacedPath(path);
+  }
+  bench.end(n);
+  assert.ok(a + 'a');
+}
diff --git a/benchmark/path/toNamespacedPath-win32.js b/benchmark/path/toNamespacedPath-win32.js
new file mode 100644
index 00000000000000..7cb38bf63aebf0
--- /dev/null
+++ b/benchmark/path/toNamespacedPath-win32.js
@@ -0,0 +1,28 @@
+'use strict';
+const common = require('../common.js');
+const { win32 } = require('path');
+const assert = require('assert');
+
+const bench = common.createBenchmark(main, {
+  path: [
+    '',
+    'c:/ignore',
+    'd:\\a/b\\c/d',
+    '\\e.exe',
+    'c:/blah\\blah',
+    'd:/games',
+    'c:../a',
+    win32.join(__dirname, '/..'),
+  ],
+  n: [1e5],
+});
+
+function main({ n, path }) {
+  bench.start();
+  let a;
+  for (let i = 0; i < n; i++) {
+    a = win32.toNamespacedPath(path);
+  }
+  bench.end(n);
+  assert.ok(a + 'a');
+}