Pingdom Website Speed Test
https://tools.pingdom.com/
website monitoring service
https://www.host-tracker.com/
卡卡网
http://www.webkaka.com/UrlCheck.aspx
WebSitePulse Test Tools
https://www.websitepulse.com/tools/
Free Web Speed Test
http://www.freespeedtest.com/
Web Page Analyzer
http://websiteoptimization.com/services/analyze/
Check Website
https://asm.ca.com/en/checkit.php