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I made several test, going from one cpu to 2 cpu (in the qaurtus option) on a dual core processor (e6600) only speed up by 10 %, because Qaurtus only uses both core at the beginning and at the end of the fitter.
And aside that, sometime Quartus runs forever when 2 cpu's are used (probably a sync problem between the multithread sw code).
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A 10% speed-up sounds reasonable for version 6.1. The average improvement is more for version 7.1, but I don't know how design-dependent that is.
For Quartus running forever, it would be good to file a service request for that if you are using version 7.1. (If you are using an older version, the problem might already be fixed.) I got the impression recently that the Altera factory thought problems like that were unusual, so they need to know about all the problems that are happening.
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