The new Magnify feature is very slow. It feels as if the mouse movements while Magnify is active are limited to a slower update / polling rate. Perhaps from using on-device calculation for the Magnify feature which interpolates with transferring / capturing movement data? If so, I guess using the Logi Options+ app to do the calculations on the PC is also not an option because that would have to be installed on every device you use the mouse, and also running in the background every time... I'm sure the engineers at Logitech can come up with a solution :) Maybe a new mouse that has more calculation capacity? (please not at the expense of battery life though)