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.
Even after factory reseting by unplugging it and replugging it back in while holding right and left mouse buttons my mouse at 1000hz still lags but now after the reset im getting no noticeable lag while at 500hz
This is what i get when checking my mouse hz on https://zowie.benq.com/en/support/mouse-rate-checker.html (see attached img) this is me CONSTANTLY moving my mouse, those 0 hz is when the website froze up completely which i believe to be due to polling rate , this doesnt happen at 500hz