Servicios en linea para comprobar la velocidad de carga y rendimiento de sitios web
https://developers.google.com/pagespeed/
http://site-perf.com/
http://www.websiteoptimization.com/services/analyze/
http://whichloadsfaster.com/#
http://tools.pingdom.com/fpt/
http://www.webpagetest.org/
http://www.pingdom.com/
http://blitz.io/