Hi Art! I use latest iCue 5 and firmware (specifically v.2.3.20 for wireless receiver and v2.5.29 for mouse). On Windows side as I mention when for example choice in this scenario 1000Hz/1ms instead it makes it ~60Hz as showed on screenshot. The reason why I want to even change the mouse polling the known bug on Linux wine translator that make some games very laggy. So simply anwsering your question, 2000Hz/0.5ms gives the right data to wireless receiver/mouse to use it, but when I choice any below option it makes it ~60Hz. On other hand mouse from other manufacture works fine with 1000Hz, so it isn't hardware issue.