diff --git a/benchmark/url/legacy-vs-whatwg-url-get-prop.js b/benchmark/url/legacy-vs-whatwg-url-get-prop.js
new file mode 100644
index 00000000000000..f703b75b16f6f7
--- /dev/null
+++ b/benchmark/url/legacy-vs-whatwg-url-get-prop.js
@@ -0,0 +1,109 @@
+'use strict';
+const common = require('../common.js');
+const url = require('url');
+const URL = url.URL;
+const assert = require('assert');
+
+const inputs = {
+  long: 'http://nodejs.org:89/docs/latest/api/url.html#test?' +
+        'payload1=true&payload2=false&test=1&benchmark=3&' +
+        'foo=38.38.011.293&bar=1234834910480&test=19299&3992&' +
+        'key=f5c65e1e98fe07e648249ad41e1cfdb0',
+  short: 'https://nodejs.org/en/blog/',
+  idn: 'http://你好你好',
+  auth: 'https://user:pass@example.com/path?search=1',
+  special: 'file:///foo/bar/test/node.js',
+  percent: 'https://%E4%BD%A0/foo',
+  dot: 'https://example.org/./a/../b/./c'
+};
+
+const bench = common.createBenchmark(main, {
+  type: Object.keys(inputs),
+  method: ['legacy', 'whatwg'],
+  n: [1e5]
+});
+
+// At the time of writing, when using a passed property name to index
+// the object, Crankshaft would generate a LoadKeyedGeneric even when it
+// remains a constant in the function, so here we must use the literal
+// instead to get a LoadNamedField.
+function useLegacy(n, input) {
+  var obj = url.parse(input);
+  var noDead = {
+    protocol: obj.protocol,
+    auth: obj.auth,
+    host: obj.host,
+    hostname: obj.hostname,
+    port: obj.port,
+    pathname: obj.pathname,
+    search: obj.search,
+    hash: obj.hash
+  };
+  // It's necessary to assign the values to an object
+  // to avoid loop invariant code motion.
+  bench.start();
+  for (var i = 0; i < n; i += 1) {
+    noDead.protocol = obj.protocol;
+    noDead.auth = obj.auth;
+    noDead.host = obj.host;
+    noDead.hostname = obj.hostname;
+    noDead.port = obj.port;
+    noDead.pathname = obj.pathname;
+    noDead.search = obj.search;
+    noDead.hash = obj.hash;
+  }
+  bench.end(n);
+  return noDead;
+}
+
+function useWHATWG(n, input) {
+  var obj = new URL(input);
+  var noDead = {
+    protocol: obj.protocol,
+    auth: obj.username + ':' + obj.password,
+    host: obj.host,
+    hostname: obj.hostname,
+    port: obj.port,
+    pathname: obj.pathname,
+    search: obj.search,
+    hash: obj.hash
+  };
+  bench.start();
+  for (var i = 0; i < n; i += 1) {
+    noDead.protocol = obj.protocol;
+    noDead.auth = obj.username + ':' + obj.password;
+    noDead.host = obj.host;
+    noDead.hostname = obj.hostname;
+    noDead.port = obj.port;
+    noDead.pathname = obj.pathname;
+    noDead.search = obj.search;
+    noDead.hash = obj.hash;
+  }
+  bench.end(n);
+  return noDead;
+}
+
+function main(conf) {
+  const type = conf.type;
+  const n = conf.n | 0;
+  const method = conf.method;
+
+  const input = inputs[type];
+  if (!input) {
+    throw new Error('Unknown input type');
+  }
+
+  var noDead;  // Avoid dead code elimination.
+  switch (method) {
+    case 'legacy':
+      noDead = useLegacy(n, input);
+      break;
+    case 'whatwg':
+      noDead = useWHATWG(n, input);
+      break;
+    default:
+      throw new Error('Unknown method');
+  }
+
+  assert.ok(noDead);
+}
diff --git a/benchmark/url/legacy-vs-whatwg-url-parse.js b/benchmark/url/legacy-vs-whatwg-url-parse.js
new file mode 100644
index 00000000000000..ca7a48466c7dc3
--- /dev/null
+++ b/benchmark/url/legacy-vs-whatwg-url-parse.js
@@ -0,0 +1,69 @@
+'use strict';
+const common = require('../common.js');
+const url = require('url');
+const URL = url.URL;
+const assert = require('assert');
+
+const inputs = {
+  long: 'http://nodejs.org:89/docs/latest/api/url.html#test?' +
+        'payload1=true&payload2=false&test=1&benchmark=3&' +
+        'foo=38.38.011.293&bar=1234834910480&test=19299&3992&' +
+        'key=f5c65e1e98fe07e648249ad41e1cfdb0',
+  short: 'https://nodejs.org/en/blog/',
+  idn: 'http://你好你好',
+  auth: 'https://user:pass@example.com/path?search=1',
+  special: 'file:///foo/bar/test/node.js',
+  percent: 'https://%E4%BD%A0/foo',
+  dot: 'https://example.org/./a/../b/./c'
+};
+
+const bench = common.createBenchmark(main, {
+  type: Object.keys(inputs),
+  method: ['legacy', 'whatwg'],
+  n: [1e5]
+});
+
+function useLegacy(n, input) {
+  var noDead = url.parse(input);
+  bench.start();
+  for (var i = 0; i < n; i += 1) {
+    noDead = url.parse(input);
+  }
+  bench.end(n);
+  return noDead;
+}
+
+function useWHATWG(n, input) {
+  var noDead = url.parse(input);
+  bench.start();
+  for (var i = 0; i < n; i += 1) {
+    noDead = new URL(input);
+  }
+  bench.end(n);
+  return noDead;
+}
+
+function main(conf) {
+  const type = conf.type;
+  const n = conf.n | 0;
+  const method = conf.method;
+
+  const input = inputs[type];
+  if (!input) {
+    throw new Error('Unknown input type');
+  }
+
+  var noDead;  // Avoid dead code elimination.
+  switch (method) {
+    case 'legacy':
+      noDead = useLegacy(n, input);
+      break;
+    case 'whatwg':
+      noDead = useWHATWG(n, input);
+      break;
+    default:
+      throw new Error('Unknown method');
+  }
+
+  assert.ok(noDead);
+}
diff --git a/benchmark/url/legacy-vs-whatwg-url-serialize.js b/benchmark/url/legacy-vs-whatwg-url-serialize.js
new file mode 100644
index 00000000000000..c0b7f5a6ce1565
--- /dev/null
+++ b/benchmark/url/legacy-vs-whatwg-url-serialize.js
@@ -0,0 +1,71 @@
+'use strict';
+const common = require('../common.js');
+const url = require('url');
+const URL = url.URL;
+const assert = require('assert');
+
+const inputs = {
+  long: 'http://nodejs.org:89/docs/latest/api/url.html#test?' +
+        'payload1=true&payload2=false&test=1&benchmark=3&' +
+        'foo=38.38.011.293&bar=1234834910480&test=19299&3992&' +
+        'key=f5c65e1e98fe07e648249ad41e1cfdb0',
+  short: 'https://nodejs.org/en/blog/',
+  idn: 'http://你好你好',
+  auth: 'https://user:pass@example.com/path?search=1',
+  special: 'file:///foo/bar/test/node.js',
+  percent: 'https://%E4%BD%A0/foo',
+  dot: 'https://example.org/./a/../b/./c'
+};
+
+const bench = common.createBenchmark(main, {
+  type: Object.keys(inputs),
+  method: ['legacy', 'whatwg'],
+  n: [1e5]
+});
+
+function useLegacy(n, input, prop) {
+  var obj = url.parse(input);
+  var noDead = url.format(obj);
+  bench.start();
+  for (var i = 0; i < n; i += 1) {
+    noDead = url.format(obj);
+  }
+  bench.end(n);
+  return noDead;
+}
+
+function useWHATWG(n, input, prop) {
+  var obj = new URL(input);
+  var noDead = obj.toString();
+  bench.start();
+  for (var i = 0; i < n; i += 1) {
+    noDead = obj.toString();
+  }
+  bench.end(n);
+  return noDead;
+}
+
+function main(conf) {
+  const type = conf.type;
+  const n = conf.n | 0;
+  const method = conf.method;
+
+  const input = inputs[type];
+  if (!input) {
+    throw new Error('Unknown input type');
+  }
+
+  var noDead;  // Avoid dead code elimination.
+  switch (method) {
+    case 'legacy':
+      noDead = useLegacy(n, input);
+      break;
+    case 'whatwg':
+      noDead = useWHATWG(n, input);
+      break;
+    default:
+      throw new Error('Unknown method');
+  }
+
+  assert.ok(noDead);
+}
diff --git a/benchmark/url/new-url-parse.js b/benchmark/url/new-url-parse.js
deleted file mode 100644
index ef60e81847682b..00000000000000
--- a/benchmark/url/new-url-parse.js
+++ /dev/null
@@ -1,57 +0,0 @@
-'use strict';
-const common = require('../common.js');
-const url = require('url');
-const v8 = require('v8');
-
-const bench = common.createBenchmark(main, {
-  type: 'one two three four five'.split(' '),
-  method: ['old', 'new'],
-  n: [25e4]
-});
-
-function useOld(n, input) {
-  // Force-optimize url.parse() so that the benchmark doesn't get
-  // disrupted by the optimizer kicking in halfway through.
-  url.parse(input);
-  v8.setFlagsFromString('--allow_natives_syntax');
-  eval('%OptimizeFunctionOnNextCall(url.parse)');
-
-  bench.start();
-  for (var i = 0; i < n; i += 1)
-    url.parse(input);
-  bench.end(n);
-}
-
-function useNew(n, input) {
-  bench.start();
-  for (var i = 0; i < n; i += 1)
-    new url.URL(input);
-  bench.end(n);
-}
-
-function main(conf) {
-  const type = conf.type;
-  const n = conf.n | 0;
-  const method = conf.method;
-
-  var inputs = {
-    one: 'http://nodejs.org/docs/latest/api/url.html#url_url_format_urlobj',
-    two: 'http://blog.nodejs.org/',
-    three: 'https://encrypted.google.com/search?q=url&q=site:npmjs.org&hl=en',
-    four: 'javascript:alert("node is awesome");',
-    //five: 'some.ran/dom/url.thing?oh=yes#whoo',
-    five: 'https://user:pass@example.com/',
-  };
-  var input = inputs[type] || '';
-
-  switch (method) {
-    case 'old':
-      useOld(n, input);
-      break;
-    case 'new':
-      useNew(n, input);
-      break;
-    default:
-      throw new Error('Unknown method');
-  }
-}