Snow Leopard freezing and slow wireless

I installed Snow leopard, installation went fine since then my computer will randomly freeze for increments of 30 seconds up to a few minutes. Happens on iTunes, Quicktime and safari. I also find to have a very slow wireless connection since the installation. Any ideas?

strange, my wifi's as fast as it normally was.
machine is: macbook 13.3" unibody 2ghz, 4gb ram
wiped it clean beforehand, installed SL fresh then restored my work via time-machine on install
Cocktail's a good util to customize your wifi speed, although it won't work on SL
My machine is set to 64bit mode though, however to be honest the 32/64 bit is a mystery at the moment, seems the kernel remains at 32 whereas the rest can happily go to 64bit with 64bit apps running happily against 32bit ones.
May want to time-machine your work, install fresh and restore from time machine. just use a usb-portable or huge memory stick, will only need to do it once.
Michelle's machine has the same problem (core duo macbook white), going to look at that tomorrow, will post if i solve it

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