Trouble with internet connection after update to Snow Leopard

Happily surfing the internet with the most recent update of Tiger until deciding to upgrade to Snow Leopard so that I could connect to a wireless printer. Noticed almost immediately that Safari was spotty, sometime normal, but often painfully slow. Have checked forums that suggest dumping caches, reseting Safari, repairing permissions, doing fresh install of SL. Nothing has worked. Can't even get internet with Firefox. Internet connection seems to work after I start up, but then fails after 5-10 minutes. Most of the time it doesn't work at all. Doesn't seem to be a problem limited to Safari since Firefox won't work either. Phone support tried saying that SL likes a WPA router connection and not WEP, which is the current setup.
Finally, I decided to boot to my clone of Tiger. After a little bit of fussing around setting up the internet connection over Airport everything works just fine! What's wrong with SL and how can I fix it. Really like the iLife11 upgrade and being able to print wirelessly, but if I can't get internet access that makes it rather pointless. Know this is a lot and rather hastily written, but please help!

Hello
Sorry, I have no answer to your problem. I just want to share that I amexeprience similar issues with my iMac since I upgraded to Snow leopard :
The LAN connection of the iMac slows down after accessing Internet, usually less that one hour. I can measure it through an Internet throughput utility on my provider's home page.
I have two Macs connected on the same DSL box, with the same OS version, Snow leopard, and nearly the same sofwtare configuration. Thus I can compare the Internet access speed :
After starting the computers, it is above 12 Mb/s.
On the iMac that I use most for Internet, it slow down to more or less 2 Mb/s after a few minutes, whereas it stays at 12 Mb/s on the MacMini.
Because of this, I believe it is LAN problem, not an Internet/DSL problem.
The same phenomenon happens if I connect to my DSL/Router with Ethernet or with Airport. The speed drops to similar values, below 3 Mb/s. Thus, the problem dose not seem to be related to LAN connection hardware.
Curiously, the speed is high again after shutting down and restaring the iMac. But it slows down again after a few minutes. Putting the computer to sleep does not help to restore maximal speed: it has to be shut down.
From all this, I draw the conclusion that the problem lies in a LAN software layer that is common to Ethernet and Airport and that is restarted only after shutdown.
I am using the MacMini as a reference for Internet access performance, in order to have a benchmark for iMac performance. I hav enot tried yet if the LAN performance of the MacMini collapses in a similar way if I use it to surf on the net.
I hope this will be helpfull do draw some attention from experts at Apple. It looks like a bug in a Snow Leopard LAN software layer.

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