I tried ubuntu 11.04 on my imac and was tragicly slow ! ...

I tried ubuntu 11.04 on my imac and was tragicly slow ! ... launching applications takes too much time for it ! Come on i wanted to launch firefox not the cia database !! After that apps were frozen (gray window) very often. I can't download torrents because of that (tranmission was frozen!!! lol) This is ridiculous i got the feeling that i have a 2000 old pc. I have 8gbytes of ram and 3.0+ghz dual core intel cpu. Ubuntu and maybe in general linux just sucks, dont loose your precious time with nonsense. It doesn't have any professional apps =its ok for me It hasn't very good hardware support (for some kind of hardware for example usb tvtuners)= It's ok for me But being so slow without any reason no!