the signal has more circuitry to go through, not to mention a wireless signal wave isn't travelling as fast as an electrical signal. the speed of the signal and the distance makes that part almost negligible, meaning the limiting factor is the quality of the circuitry involved, which is why cheap dell mice always lag like a mofo.
this problem shouldn't be exclusive to heavy load, though. if its during a game, try enabling the 'hardware mouse' option.
![[H]ard|Forum](/styles/hardforum/xenforo/logo_dark.png){kind=logo}