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9.1 Windows 9x/ME
This update fixes three problems:
1) Unnecessary packet re-transmissions (i.e send/upload) in extremely high-delay satellite links.
2) Makes it possible to enable large window support (Scaling) so that TCP Receive Window (RWIN) can be set higher than 65535.
3) Makes it possible to activate Time Stamping.
If you are not on a satellite link or not one of the rare users who need RWIN > 65535, then you probably don't need this, but it does not hurt to apply it.
The claim is that the tweak (IRQn=4096) improves network performance by allocating 4 megabytes of memory as a buffer for the IRQ (n) used by your network adapter. However:
While it doesn't help, the good news is that (like TTL) this setting doesn't hurt (assuming you don't screw up your SYSTEM.INI file). Windows just ignores settings that it doesn't recognize.