As part of my usual quality assurance routine, I did a crawl through the latest Herbie reports, looking for timeouts, long runtimes, and sampling errors. In summary, Herbie is now really fast! I found only a few benchmarks that run for more than 20s, with even quite large benchmarks running fast. What makes Herbie slow? Taking a look at a few timelines, it seems like Herbie now spends most of its time, especially for the slower benchmarks, in series expansion and pruning. That said, it seems ...