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Originally Posted by opflix
be careful about the number of zones you have setup... too many & it'll freeze up on you. you should have it on its own server if you plan on using it heavily 
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Actually, you can run quite a few if the zones are spread between publishers. Loading up all your zones in one publisher will definately cause a speed problem. Same thing with advertisers and campaigns. Use campaigns liberally - segregate the ads within each advertiser as much as reasonably possible.
If you aren't keeping ANY stats, the above won't help nearly as much. Updating stats really slows things down.
Here's a few tips for cranking out the banners:
Run your maintenance script every hour - this alone will speed things up dramatically.
Install eAccelerator (upgrade to Turck-MMCache) php accelerator - this reduced my cpu load from 80+% to about 3%
Turn off all the database options (Use persistent connections, Use delayed inserts, Use database compatibility mode )
If you don't need stats, turn off everything.
Otherwise, set stats to Compact. Do prune stats at the minimum level unless you have to keep them longer.
Don't log the source param unless you need it
Don't use a beacon image
Do not use hostname lookup or IP determination
Use local directory for banner storage
Don't log into the admin user interface during peak hours, especially for stats!
HTH