Watir Webdriver自帶一個(gè)gem  Watir-WebDriver-Performance， 可以對(duì)頁(yè)面的性能進(jìn)行一些簡(jiǎn)單的測(cè)試。

方法如下：

require 'watir-webdriver'
require 'watir-webdriver-performance'
 
b = Watir::Browser.new :chrome
 
10.times do
  b.goto 'http://watir.com'
  load_secs = b.performance.summary[:response_time]/1000
  puts "Load Time: #{load_secs} seconds."
end

得到的結(jié)果如下：
Load Time: 3.701 seconds.
Load Time: 0.694 seconds.
Load Time: 1.874 seconds.
Load Time: 1.721 seconds.
Load Time: 2.096 seconds.
Load Time: 0.823 seconds.
Load Time: 2.362 seconds.
Load Time: 1.008 seconds.
Load Time: 1.761 seconds.
Load Time: 2.066 seconds.

可以用的方法除了response_time之外，還有：
:summary
:navigation
:memory
:timing

注意，目前只能支持chrome和IE9的版本