My quote was our observed performance across our fleet of developer machines until ~December of 2019. Maybe our project was hitting some pathological edge case (more likely this is just the performance you can expect for non-toy projects), but there's no documented way to debug this as far as I (or anyone else in our organization) could tell. Note that this was the performance even if nothing was changing on the mounted file systems and with all watchers disabled. Bystanders can feel free to roll the dice, I guess.