I was wondering whether there are any best practices or if you have any good tips on improving performance of a self hosted openX instance.
Apart from the usual suspects (e.g. tuning apache, php and mySQL), using memcached for caching etc.
Is there any room for a CDN or other proxy cache in front of openX? (my guess is no due to the dynamic nature of the delivery scripts results)?
I suppose you could cache the actual creative (image files, etc.) but you've guessed correctly that caching the scripts isn't going to be a good thing.
Based on some recent questions, it looks like there's not a whole lot to be done to improve OpenX's performance, unfortunately.