Comment by dzaima

Here that can go both ways - SIMD parsing can allow handling arbitrary changes in reasonable time for files below like maybe 100MB (i.e. everything non-insane), whereas incremental parsing can allow handling small changes in truly-arbitrary-size files in microseconds. A trade-off between better average-case and worst-case time. (of course the ideal thing would be both, but that's even more non-trivial)