hi my page is taking about 9s on local server and about 20s on remote server, i am sure that the problem is in js, but i can’t find what makes it slow, can you please help me find a solution or any tool to hunt the problem down?
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All the modern major browsers have js profiling builtin now.
Firebug & Chrome both have good client script profiling tools, also they have http traffic monitors which may also help you diagnose the issue. IE also has one.
Here is an example of the firebug profiler in action

[EDIT]In Chrome, press Ctrl+Shift+J to open the JavaScript profile page.