I don't work at Dreamhost but from what I've read on the forums here it seems like that's about how much CPU a shared account can use up before it starts triggering flags. They do have the Private Servers now, and the first week they'll monitor the account to see what kind of resources it will need - and adjust the account for that. Not sure about the details on the PS, but I do think you might be pushing the CPU limits of a shared account.
Then again, not sure about that either
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