Got a new Keychron computer-keyboard recently (replacing one with a busted usb connector, that's another story) . I've got mouse movement on fn+J/K/L/I . Fits me perfectly, but mouse-left had an annoying lag. Tried moving switches around, tried using different keys (/so/ confusing). Turns out just using a *different layer* for mousing solved it! So this is definitely a software bug. Noticeable lag on *ONE* key. Could have tried factory reset, but -- BOTHER. #KeyChronV10U @keychron