I've been having the same problems with EasyPHP1.7 under high loads ( 15 people in a 20 question quiz. Can't remember the Server specs.)
Quizzes aren't loading up completly (they time out far too quickly.) Reducing the load solves the problem, but if I can configure things to just work slowly under a heavier load, that would be better.
I'm currently in the process of trying to fix this.
Hardware and performance
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