Here are my findings of entropy extraction estimates from mouse movement events in the browser. Tables below show the results sorted by the minimum entropy extraction. Timing events, keyboard events, and other potential sources of entropy that can be collected from the user are not considered here.
A [visual representation][1] of slow, medium, and fast mouse movements can help visualize why the entropy estimation increases as the mouse velocity increases. The recorded data was plotted with Gnuplot as follows: