Provide graphs for benchmarks

[danielcompton]

Thanks for putting together the benchmarks, that's really helpful. It would be nice to be able to see a graph (perhaps on a log scale) to understand the numbers better. Perhaps reducing all numbers to 1 or 0 decimal places would make them easier to read too.

[blueberry]

I wanted to do that from the beginning, but got tired after writing a lot of documentation. It's on the to do list for later, but not on high priority though.