Recent Drop in Bittorrent Speed?

Windows XP users who uses bittorrent actively might have noticed a significant drop in transfer speeds if they installed the latest critical release update from Microsoft dated Jan 8th, 2008. This is because the latest updates installs a new version of TCPIP.SYS, and this reverts the maximum allowable half-open TCP connections back down to 10. After some digging, here are the difference in the version numbers:

  • Older TCPIP.SYS version: 5.1.2600.2892
  • Newer TCPIP.SYS version: 5.1.2600.3244

Unless a new version of BitComet or any other programs that originally patches the limit automatically is released, one has to raise that number manually in order to optimize one’s bittorrent transfer speed. Here’s how:

  1. Visit and download the latest EventID 4226 Patcher.
  2. Unzip and run EvID4226Patch.exe.
  3. Increase the maximum connections to between 50 – 100.
  4. Choose Cancel when prompted to insert your Windows XP CD, followed by Yes to whether you want to keep the unrecognized file versions (Print screens below).
  5. Reboot Windows XP.

This should return the transfer speeds to its previous glory. Enjoy~

Solution adapted from


3 thoughts on “Recent Drop in Bittorrent Speed?

  1. I tested the LLVLORD patch, but my speeds were still quite miserable. Not too sure what else got installed with that CRITICAL UPDATE but only a ‘system restore’ point seemed to fix it. I’m not the only one complaining, either. TCPIP 3244 has become a good keyword to drive traffic to my site. People are looking for solutions, for sure.

  2. It’s true that using System Restore will restore the original bittorrent speed attained prior the critical update. However, there has to be a legitimate reason that Microsoft is updating TCPIP.SYS and most likely it is due security issues. Therefore I highly do not recommend restoring TCPIP.SYS to the older version and did not include it as part of the solution.

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