页面加载慢原因分析工具

http://wenku.baidu.com/view/ec535808763231126edb1198.html
http://www.scseoer.com/page-speed.html

YSlow
http://liudaoru.iteye.com/blog/354886

SEO相关
http://www.scseoer.com/seo-tools/page/2