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1) Perform optimisation if possible.. if you do have issue with lack of CPU within applications but have lots of memory you can do lot's of caching at various points within the stack to alleviate that.
2) Don't know.. if you have shell access use htop to check live resource usage
3) Depends on what application your running, ideally you'd want total CPU usage less than 100% at peak (by a decent margin)
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I don't endorse a god damn thing...... 
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