As standard, Windows will poll USB devices once every 1ms. However, this can cause the issue of laptops unable to enter the C3 processor power-saving state. By increasing the USB polling interval from 1ms to 5ms the processor can enter a C3 power-saving state during its inactivity.
There are also suggestions that decreasing the polling rate will also save energy generally. I’m not sure.
But, anyway, until I hear that all of this is some kind of urban myth, I’m willing to give it a try.
Here’s a couple of scripts (save them with .reg extensions and run them as required) that I rattled off to activate the “idle” (5ms) and also to return to “normal” (1ms)…
Activate Idle Polling Interval…