From my own experience they are mostly concerned about crashes or similar crippling conditions. There is a huge list of those, so temporary 30-60% CPU usage will probably get buried unless a large number of people are affected. Chances are bug reports for low performance on everyone's video chip set exist already, though. Try searching xorg bugs for intel 950.
You can try, but be sure to read through these: /wiki.ubuntu. com/X/Reporting /wiki.ubuntu. com/X/Debugging
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From my own experience they are mostly concerned about crashes or similar crippling conditions. There is a huge list of those, so temporary 30-60% CPU usage will probably get buried unless a large number of people are affected. Chances are bug reports for low performance on everyone's video chip set exist already, though. Try searching xorg bugs for intel 950.