Slows with time

MacBook Pro, about 2 yrs old, 500 gig hard drive about 200 free, 4GB Memory. 2.67 Ghz, OS 10.5.8.
It runs fine when I turn it on, but then slows to a C R A W L after about 2 hours.  Took about a minute to get this screen to open when I clicked on Start A New Discussion.  Whether using Safari, or non-I'net apps, it is very slow.
Restart does not help.
Turning it off altogether however brings it back to usual speed.
The unit is not unusually hot.
Happens whether running on AC or battery.
ANy ideas?
Thanks

I have almost the exact setup as you, and airtunes never slows down my internet connection.
Has it just happened recently? Have you done a reset on the TC? Make sure you are using the g network, and not in the b only mode.
You can also make sure everything on the network are getting good signal. You can check the signal strength from Airport Utility (in the logs and Stats pane).

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