Slow wireless internet connection after 10.6.4 update

After the initial excitement switching from windows to mac, I'm now having a problem I can't figure out. This problem is mentioned many times in several forums, but I'am unable to find the proper solution.
After unpacking my new MacBook air last week everything worked simple, smooth an correct. Then an automatic update to OS X 10.6.4 was downloaded and installed. I'm having troubles with my wireless internet.
Airport seems to be functioning ok but most sites take ages to load. There's also problems with loading pictures, movies, dynamic contents, etc. Some sites function partially on Firefox, Safari seems to be hanging al the time.
Resetting router, starting MBA in safe mode didn't have any effect. On the ethernet connection the mac and internet is working as a dream. Other windows device also function normally. How do I get my wireless internet working properly??
Help!

I had exactly the same problem after updating my mac to 10.6.4. I did the usual and trawled the net but could not find a decent fix. It became very very frustrating so in the end I rang apple and luckily I spoke to a technician who had exactly the same problem with his machine. He explained it doesn't effect every mac for reasons I wont go into here but in order to fix this problem 100% guaranteed, you need to do a reformat and a reinstall. This should be done periodically anyway to keep your machine running in tip top condition. I wasn't happy to have to do it but in the end I'm glad I did.
For those who have not done this before see instructions below.
1. Back up your disk with time machine to an external HD
2. Boot from installation disk (holding down C)
3. After choosing english language select utilities from menu bar and select disk utilities.
4. Select your mac hard drive, erase, and in security options select "zero out disk" and erase.
5. Reinstall operating system with installation disk, when done update to 10.6.4 assuming that was the system you had installed when you backed up.
6. Reboot again holding C with installation disk, select utilities then restore option, choose your time machine backup and away you go. FIXED!
It takes a while but you will probably spend just as much time hunting the net for fixes that just wont work and anyway you end up with a clean install that will probably fix other little bugs you were unaware of.

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