Repro script for Chrome Windows WebDriver performance issue

test-webdriver.js

/**
 * This Node script is to demonstrate an issue whereby WebDriver for
 * Chrome on Windows runs very slowly -- significantly slower than both
 * Chrome on macOS and Firefox on Windows.
 * 
 * Results:
 * 
 *   macOS Mojave / Chrome 76:   2,806 ms
 *   macOS Mojave / Firefox 67:  3,504 ms
 *   Windows 10   / Firefox 67:  2,380 ms
 *   Windows 10   / Chrome 75:  21,620 ms
 *   Windows 10   / Chrome 76:  19,626 ms
 *
 *   Note that most of the time in Windows / Chrome cases is spent in the call
 *   to `await driver.get('http://example.com');`, which each take ~4 seconds.
 *
 * Repro instructions:
 * 
 *   1) Install WebDriver for Node:
 *      $ npm install selenium-webdriver
 * 
 *   2) Download the latest WebDriver plugin for Chrome and Firefox:
 *      http://chromedriver.chromium.org/downloads
 *      https://github.com/mozilla/geckodriver/releases
 * 
 *   3) Test on Chrome:
 *      $ node test-webdriver.js chrome
 * 
 *   4) Test on Firefox:
 *      $ node test-webdriver.js firefox
 * 
 * System details:
 * 
 *   Windows 10 Home, 64-bit, Version 1903, OS build 18362.175
 * 
 *     Chrome 75.0.3770.100
 *       ChromeDriver 75.0.3770.90
 * 
 *     Chrome 76.0.3809.25
 *       ChromeDriver 76.0.3809.25
 * 
 *     Firefox 67.0.2
 *       geckodriver 0.24.0
 * 
 *   macOS Mojave 10.14.5
 * 
 *     Chrome 76.0.3809.25
 *       ChromeDriver 76.0.3809.25
 * 
 *     Firefox 67.0.3
 *       geckodriver 0.24.0
 */

const webdriver = require('selenium-webdriver');
const {performance} = require('perf_hooks');

const browser = process.argv[2] || 'chrome';
const numTabs = Number(process.argv[3] || 3);

async function main() {
  const tBuild = performance.now();
  const driver = await new webdriver.Builder()
      .forBrowser(process.argv[2] || 'chrome')
      .build();
  console.log(performance.now() - tBuild, 'build driver');
  console.log();

  const firstTab = await driver.getWindowHandle();

  for (let i = 0; i < numTabs; i++) {
    console.log('tab', i);

    const tOpen = performance.now();
    await driver.executeScript('window.open()');
    console.log(performance.now() - tOpen, 'window.open() for new tab');

    const tSwitchNew = performance.now();
    const handles = await driver.getAllWindowHandles();
    await driver.switchTo().window(handles[1]);
    console.log(performance.now() - tSwitchNew, 'switch to new tab');

    const tGet = performance.now();
    await driver.get('http://example.com/');
    console.log(performance.now() - tGet, 'get url');

    const tScript = performance.now();
    const r = await driver.executeScript('return 1 + 1;');
    console.log(performance.now() - tScript, '1 + 1 =', r);

    const tClose = performance.now();
    await driver.close();
    console.log(performance.now() - tClose, 'close new tab');

    const tSwitchBack = performance.now();
    await driver.switchTo().window(firstTab);
    console.log(performance.now() - tSwitchBack, 'switch back to first tab');

    console.log(performance.now() - tOpen, `(total tab ${i})`);
    console.log();
  }

  const tClose = performance.now();
  await driver.close();
  console.log(performance.now() - tClose, 'close first tab');
  console.log();

  console.log(performance.now() - tBuild, '(total)');
}

main();