The problems I had with the history were the following:
(1) I didn't care about the histogram so I ditched it.
(2) I'm more interested in the times than the dates so I swapped x for y.
(3) I hate it when the axes are marked in numbers like 25.21523 instead of 25.0 so I fixed that.
(4) I wanted the average computed as an exponential moving average and I wanted to see it in red.
Uh, see:
http://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average for an explanation. This means that the average never makes a very big jump.
(5) I don't do *that* many solves so I figured it would be better to plot them all rather than their bin averages.
There are a few more things I'm considering doing:
(1) Add more room for the history by making the whole image larger.
(2) Change the vertical axis to show number of solves rather than the date of solves. This is because I seem to get better proportional to how many solves I do rather than the date of the solve per se. Ideally, I'd like both information, the number of solves and the date.
(3) Change the vertical axis to show "total amount of time solving". This is like the "total number of solves", but obtained by adding up the solution times. This way it weights your fast (later) solves less. The idea here is to make the vertical axis be proportional to "amount of time spent solving the cube".
But in general, if I practiced instead of messing around with Prisma Puzzle timer I'm pretty sure I'd be a few hundredths of a second faster right now.