10.6.5 and network connection slowdown, flakiness

Ever since the 10.6.5 update (applied via Software Update), I've been plagued with a very severe slowdown in my internet connection. Typically, when connecting to most websites, in the Firefox status bar, I get a lot of "Looking up..." "Waiting for..." Connecting to..." Transferring date..." messages. Often, it can take 10-15 seconds to load a website. For instance, it took a good 10 seconds for the Apple Support page to load (linked to from the Apple homepage.) I'm seeing this sort of activity both with my router between my modem and my iMac, or with the modem directly connected to the iMac (with the Firewall enabled when directly connected.)
Additionally, I've had instances where, if I leave the iMac alone for a few hours, the internet connection itself will drop, and I have to re-boot the iMac to get the connection back. If a user account is up and, say, a browser or mail is running during that period, those apps will lock-up and have to be force-quit.
And, after the iTunes 10.1 update, iTunes seems to need to rebuffer all streaming audio on an annoyingly regular basis. Like, every 30-seconds to a minute.
This is NOT a wireless network.
I've rebooted the iMac, router, and modem several times and none of it seems to help. DNS settings on the router and the iMac match (currently, Comcast's opt-out servers. When this problem started, I was using OpenDNS servers)
Anyone else experiencing similar problems after the 10.6.5 update?

I too often have a devil of a time connecting to a Linksys WiFi router with a brand-new unibody MacBook Pro 15", 2.66GHz. I noticed that if I boot the machine off an external Firewire drive this seems to be more of an issue than if I boot off the internal drive.
I beginning to thing there's some kind of interference between the Firewire system and the WiFi system.
The router is a Linksys with the latest firmware update. My MacBook and iPhone 3G, iPhone 4 connect to the router fine.

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