Controls too sensitiv

The controls are just to sensitive.

This includes wasd, left,right,up,down and the mouse as well as the mouse mode activated by space.

Start by reproducing the sensitivity problem with WASD, the arrow keys, the mouse, and the space-activated mouse mode. Trace the controls entry point used by the visualization and determine consistent sensitivity expectations for each input; done means all listed controls feel less sensitive without breaking navigation.

Written by the indexing model from the issue text.