I know that people have had experiences similar to yours. It's fine to disagree, but AFAIK pretty much all benchmarks show that there is no noticeable difference in performance from 7 to 8 to 10 and this matches with my own experience. I refuse to upgrade unless I get similar or better performance. But then again, I'm not really interested in researching every single benchmark. Windows is fast, stays fast, and that's pretty much all I care about.