[UPHPU] Running out of ideas to speed up a site

[Alvaro Carrasco]

Jason Porter wrote:
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> I took some freelance work to improve the speed of a site.  I've done
> all of the things that I could think of, improve the includes in the php
> code (instead of doing url includes to the same site), configure
> mod_expires, mod_deflate (site is on apache2 (2.0.52)), I've even gone
> so far as to install eaccelerator thinking maybe it was PHP stuff.
> Sometimes the site loads really fast, other times it takes 20 seconds to
> load up the site.  PHP is running in CGI mode, which may have something
> to do with it (php 4.3.9 BTW).
>
> Box is a coloc box running RHEL ES 4.  There's hardly any server load on
> it, top shows it typically staying around 5% or less on the CPU load.
> He has 60ish sites setup as virtual hosts and they each have a few
> mod_rewrite rules, but this really shouldn't be much of a problem.
>
> Anyone have experience in tweaking apache or troubleshooting slow sites?
> ~ I'm currently at a brick wall, I have no idea what to look at next.
> - --
When it comes to performance I never touch the code until I've profiled 
it. Too often, you make all kinds of code modifications trying to 
optimize it when the problem is some rogue loop somewhere.

I normally run the xdebug profiler and view the output on kcachegrind or 
wincachegrind. It should tell you exactly where the problem is.

Alvaro