Openads 2.0 is pretty solid. To give you an idea about performance though... it can get intense and rival vBulletin.
I have a month old dual dual-core server, 4G RAM, etc. running a forum with about 1000 online users most of the time. Without OpenAds, the server load hovers around 2 under load. With OpenAds 2.4 running with 3 zones, the server load went to over 30. I rolled back to OpenAds 2.0 and it brought it down to around 10, which the server could handle, but I wanted to expand the use and speed up my page loads. So I just got another server just to run OpenAds... wish I could swap them, because its a dual quad-core and seems to be idling most of the time. It maxes out around 1.5 under load, and my main server is now staying around 2. So OpenAds 2.4 is not something you want to do unless you put it on a sizable server if you are planning on loading it up pretty heavy.
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