I'm trying to optimize my header and I was wondering which plugin would call jquery. Is there a debugging tool to know which plugin is doing what in the header ?
Plugins and themes tend to use
I would rarely advise this, but since you only need to do it temporarily, you could modify WordPress core and run a debug backtrace for every call to this function.
Now pop the following in your theme's
Now whenever you load a page on your website, a log gets generated in your WordPress
Remember! Undo the changes once you've found out what you need!
There is a nifty little function called debug_filters() which lists the callbacks registered on a certain hook.
You would call from your theme, at the end of the header.php file for example: