I’ll admit I use a wired mouse but that’s because I play on a laptop and between headset, power and mic I didn’t want to deal with another cord. Besides, it’s less than 10cm from mouse to receiver so if there’s lag I’m not seeing it.
Something else I was thinking about was interference from other wireless devices - Back when I was in school the housing management division had to ban personal wifi because it was affecting the school-provided hotspots.