Cursor movement is excessively fast - flies across the screen!

[gdinit]

Hi,

As stated in the title, the cursor movement is excessively fast - flies across the screen!
I assume that is due to the FPS-bound movement speed and the FPS being 400+.

The system I see this behaviour on, is built in 2016.
Looking at original commit dates, I am guessing my machine is probably a more powerful PC than developer's original development machine however this is not a "monster PC" by today's standards, so I can only assume the issue would be much worse on an actual modern gaming PC.

A PR is submitted which seems to fix the issue on my PC by slowing down the cursor movement greatly (from 440 FPS down to 60 FPS)
#4

The "new speed" may require further tweaks to match dev's taste.