Safari is nice - faster than Firefox in pretty much all aspects.
lie, in below aspects its slower than firefox.
1. the urlbar of safari is not smart enough to help users reaching the websites theywant, firefox can save them up to 15 seconds here.
2. build-in FAYT in firefox save you 1 second
3. drop down menu with list of most visited websites at urlbar save mice users another 1-15 seconds.
4. allowing users to download different files into different folders save another minutes or so since users don't need to later go through every folder to re-arrange their downloads
4. search among large amount of downloads in download manager save users potentially <1 minute to 20 minute, depends on how many downloads you have since last time clearing the list.
5. DNS problem with safari will delay users for unknown amount of time, rare situation tho.
6. ability of saving more than one pair of usernames/passwords on same webpage save many users at least 10 seconds
7. notification bar for passwords remembrance save users unknown amount of time when they got the password wrong.
8. able to handle ftp protocol directly save users another 1-10 seconds
...
...
or you think those time isn't time?

you have been spreading too much misinformation already, your "all aspect" is only supported by a JS test and derived from your own personal experience which many people previously told you that may be a problem with your own computer. Its quite irresponsible for you to make such statement like you made above, it really amounts to slander.
I've been using Safari for some time now so I'm somewhat biased towards it, however, yesterday, I figured I'd give Firefox a try. Right away I noticed how poor the scrolling, even with "smooth scrolling", that I reverted back to Safari. Nothing for OSX really compares in my view.
Don't let Clevin hear this!
why? because I will tell him/her to try out firefox 3.5 today? Did I ever deny a problem of firefox if its true? Pixel scrolling is fixed in firefox 3.5, you dont want him/her to be informed about this?
To OP, generally safari should be stable enough for day to day use. you might want to do a reset of safari and see if it helps.