Wordpress: W3 Total Cache + APC
 

Have you ever used it ?

Looks promising, considering even adding cloud from S3

I was sooo wrong..... APC needs heavy customisation, it's not compatible with Zend that is standardly bundled with PHP, etc...

Got so many PHP errors Couldn't allocate memory" even with 256MB dedicated for cache (and the whole site cache was only 90MB), that I gave up. With simple Disk cache it's fast enough and no problems with memory, etc.

So if using APC beware. Might be worth customization for some people, it's definitely our of box solution.

I nearly forgot to mention tons of blank WP pages you get if you use APC cache. Very annoying, you have to delete all domain cookies, re-login and do the required action....and hope it doesn't give you blank admin again.

APC can radically improve the serving of dynamic php content and cut resource use dramatically under some conditions. I highly recommend it where possible. It doesn't play well though with the old zend optimizer (This is very likely the issue if you are using it) but it works with the regular zend extensions. You can tweak it a little bit but you usually don't have to.

signupdamnit, you are right. But it's not worth playing around in my environment, simple disk cache decreased the page load by 50%.