Hello.

Ive been experiencing very odd bandwidth problems lately. It all began when my connection was timing out every 5 seconds or so. After days of tampering with my router and settings i finally saw in the windows update logs that as part of my automatic updates, new network drivers were installed. I rolled back the drivers and the time-out issues went away. But lately ive been having a new problem. At high download rates, no matter which software is accessing the net, this could be quicktime, utorrent, firefox, or any other software, the cpu usage kicks to 90-100% at times and all becomes hell. The cpu usage increases proportionally to the download rate. My connection allows for upto 1MB of download. at 100k, 30% or so of my cpu is active. At 300-400, (trailer off quicktime NOT PLAYING) 75%, and at 400KB+ range, utorrent, the cpu usage is always at 100%. utorrent does seem to be affected the most by this. im guessing this is due to the number of active connections it deals with. So im in a pickle.Ive already disabled the AutoTuning feature of vista which changes your RWIN and turned it off. The drivers seem to be functioning fine network wise. Im hoping someone can point me into the right direction. Thank you in advanced for reading this.

Borna

Use performance monitor to narrow down the exact culprit.

On top of Vista soaking up resources to the limit of your machine consider too the nic card and it's factory drivers.
Even if some people don't believe it most home nic consume a lot of processing power. Not only do I say it Microsoft says it on their qualifications tests. (wonder if they passed?)

Be sure to manage all ports and applications that may be using resources.

I read it wrong and answer it wrong too. So get off my case you goober.