Sets NetworkThrottlingIndex = 0xFFFFFFFF under Multimedia\SystemProfile (Windows default is 10). By default, whenever multimedia is playing, MMCSS caps the network stack at ~10 packets/ms to protect audio/video from interrupt storms. Disabling that cap removes an artificial ceiling that can matter on fast (multi-gigabit) links and for latency-sensitive online play. Trade-off: on some NIC/driver combos more aggressive packet processing raises DPC/interrupt load and can hurt audio smoothness — if you get crackle or DPC spikes, revert (or try a moderate value like 20 first). Reboot required. Reversible; auto-snapshots the prior value.
MaxTweaks applies this tweak with one click and snapshots your original setting first, so you can revert it cleanly at any time. A System Restore point is offered before batch changes, and every tweak links to its official source.
Get MaxTweaksOfficial documentation: https://learn.microsoft.com/en-us/windows/win32/procthread/multimedia-class-scheduler-service