I'm seeing the same problem, especially at the command prompt of any windows virtual machine, but also
in windows applications.
I've booted to bios, set it higher, but it doesn't seem to have any effect.
This is like 2400 Baud all over again.
8.0.4 build-744019
Still a problem a year later.
I'm now on version 9.0.1 and still laggy cursor when using keyboard arrow keys.
Keyboard over-run (let up on key, cursor continues to move for a half second).