Slow Wireless Internet Since 10.5.5 Update

Hi.
When I click any link or enter any URL in Firefox, the status indicates "Looking up (URL)..." for literally 5-10 seconds before loading the web page. This happens on all browsers (including Safari, FireFox 3, Camino, and Opera) and has started since the 10.5.5 update. I've tried it on my college's network and it does the same thing. Running Windows via Boot Camp does not suffer the same problem. I have many other computers and devices on the same network that do not experience this problem, thereby eliminating anything other than the Mac OS at fault.
What the heck did 10.5.5 do? Is there a fix for this other than running a restore with Time Machine and going back to 10.5.4 (which IMO is super stable and problem-free)?

Weird problem here too. I've had wireless problems of all kinds since Leopard. Then with 10.5.3, 10.5.4 things settled and worked fine. Now this!! Ahhhhh! I have full wireless signal, email is slow but works. But browsing is very slow. Funny thing: not to every site. There are some I used to visit which are now almost unreachable; they start to load, then they fall asleep with the browser saying "connecting to...". Once every 10 or 20 refreshes then succeeds in loading the page. But clicking the next link from there the problem is back. Definitely after 10.5.5. No other changes of any kind. Not a DNS problem, at least not directly: nslookup looks good, tracing routes is ok also (14 hops away). Connection to other machines in the lan ok. Connections from ethernet linked machines (and also from the iphone) to the internet no problem.
I'm looking for a way to go back to 10.5.4!!
P.S. By now I'm almost sure this is a hardware issue, some sort of incompatibility at a hardware level, which apple is aware of (but can obviously not admit) and at some time decided to patch somehow - using some sort of software hack...but then forgets about it at the following update, so here we go.

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