To answer your specific questions about the CPU load:
A website is considered to be using "excessive amounts of resources" when it monopolizes the resources available using 1% or more of system resources for longer than 60 seconds.
In general, we're trying to protect our other users on the same server, and if there's a slowdown and the server becomes even remotely "sluggish", we will investigate.
Please refer to our Terms and Conditions page for all the details:
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