I have a Corsair scimat pro rgb and when the polling rate is set to 1000hz i have huge lag spikes , eg on osu! i would go from the capped fps limit of 240fps down to as low as 10 fps if i moved my mouse, tho if i change the polling rate to 125hz everything works fine.
Its the same with every game ive played.
Ive tried rolling back mouse and nvidia drivers but nothing has helped, the only way i managed to fix it was to uninstall my mouse drivers from device manager and replug my mouse but after reboot the problem came back again.