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I had issues initially with Yosemite... especially internet speed... I did my due diligence, reset PRAM, rebuilt permissions, made more space on hard drive for memory cache, eventually it got back to normal. I believe that spotlight was indexing everything in the background and killing performance... took 2 days, I'm not sure what did it but a couple days and the usual fixes took care of it...
Bear in mind you should not upgrade to the latest OS until about 2 weeks after it comes out, and also that the last 2 have been memory hogs. If you have an older mac with 4Gig or less, stick with Mountain lion or whatever you got...
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