I would rather have a chart of my WPM speed over the course of the 2 min. afterwards.  Thats probably not practical though it might be interesting. 

If there was a real time WPM, I would be tempted to look and there it goes .... down.

The one bug I see is that on the replay where even though it says the # WPM was done using Colemak the keyboard still automatically defaults to Qwerty.    Hopefully it isn't too big a deal to show the correct keyboard by default on the replay.

The first time I watched I was going hey my fingers are really flying!   Then I realized what was going to on and switched it to Colemak.   oh...