I'm looking at installing APC (Alternative PHP Cache) on one of the VPS'es I support.

After doing some research, it sounds like it doesn't play nice with mod_suPHP, which I have installed as well.

Anyone have any experience with those 2?

The VPS - currently - only has 2 websites on it, one is a WordPress site, the other is Joomla.

Also, anyone using a CDN to offload content? Is it pricey

Thanks for any advice!