I am running Android only, so perhaps that is why I have not seen it. Sounds like a driver issue.
I also said that I was going to see if I noticed a slow down with a BT mouse -- Well, I tried 2 different Apple "magic" mice, and ... they don't work. The Apple Magic Mouse is recognized (again, this is in Android Only) as a mouse, Pairs, connects, and is shown connected as an input device, but it never works.
I'll have to try with a regular (Logitech) BT mouse.