I am maintaining a custom service system which is written in apache + php + mysql + html + javascript, the question is it costs too much time to get the web pages, What tool or method am I supposed to use to find where the time-consuming point is?
I'm not sure what server-side tools there are in the PHP world, but if you've got lots of client-side stuff happening in Javascript then FireBug has a pretty good cleint-side profiler.