I should say, that I've only a couple of times gotten over 100 active users at one time. So who knows if it scales the same. But I'm finding 4.0.8 is about as fast and stable as 3.8.x was. And I have a chatbox + sidebar + gallery-what's new on the forum home. Page loads are not generally a problem though I've turned off some 4.x features to speed things up on the forum index - but I didn't really need those anyways. (Should say here that vB3.x was equally inefficient in displaying 'who's on')
Had to turn off Facebook Connect, but that was due to the hang loading the fb logo and fb bots - not a vB problem. Had to restrict Guest access due to bots following all links and causing SQL cpu usage to spike. I'm lucky in that the bloated (due to post/thread cache) file size of the db is not an issue with the hosting provider.
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