Come up with more metrics to measure

[markerikson]

Right now we're only measure FPS, plus the values from a Chrome trace (time spent "scripting", "rendering", and "painting"). These are better than nothing, but they seem insufficient. In particular, they really only start changing if the app is continuously updating in a stress test scenario (ie, dispatching actions every few milliseconds).

It would be good to start figuring out what other metrics we might want to measure, and how we should try measuring them.

Also, the "average FPS" metric is presumably a bit flawed, because it only shows the changes, not exactly how long we spent at a given FPS rate. If we spent 20 seconds at 60 FPS and 10 seconds at 50 FPS, the average FPS isn't 55, it's ( (60 * 20 + 10 * 50) / 30), or something like that. The current math is passable enough for now, but it'd be nice if we actually used the timestamps from the performance.measure() calls to calculate a more accurate FPS result.

[markerikson]

Another potential source: the JS framework benchmarks repo at https://github.com/krausest/js-framework-benchmark .