Currently I am running a 15" MBP with a 2.2ghz intel processor 2ghz ram 128mb video ram etc. i purchased this notebook 2 years ago or so (actually on the date that leopard was released). I purchased snow leopard a month a go (or whenever it was released), and put the operating system on the computer. Since doing this, my computer has been unbareably slow. the os which was supposed to speed up my computer, has made it slower than i could even imagine. horrendous. the computer was noticeably slower with snow leopard on it from the second the install was done. my question. i need to reinstall snow leopard. i have a time machine backup. if i wipe the harddrive, put snow leopard on the computer, and then restore my time machine backup, will my computer still be slow? does time machine back up all of the system files (i'd imagine some memory managemnt file or something isnt working too hot in my system right now) or just my application data, music, movies, and user preferences? i have so many customized settings and apps that it would take me literally days if i just wiped the harddrive and installed everything without help from something like time machine. any thoughts?