To be clear: we track it in the sense that we still have it running as part of old dashboards. It's cheap, and every so often it catches an unintended regression.

The SpiderMonkey team is very much on board with ignoring microbenchmarks. We care about Speedometer, because it correlates reasonably well with real-world performance. We pick and choose which parts of Jetstream2 we bother with. Anything older than that is strictly a measuring stick, rather than a target: it's nice when the numbers go up, but it will only happen as a side-effect of work we're doing for other reasons.

Notably, all the SunSpider wins on this graph are side-effects of Speedometer work we've been doing this year.