Haha not sure if we'll get a large lag spike like that again to know for sure, but definitely was a problem with a plugin, which was removed around 5PM EST yesterday. NodeBB was crashing anytime somebody went to a certain section in their profile, which as you can imagine was happening quite often
Disable Reputation System option seems incompletely implemented.
This is probably old news, but there seem to be some parts of the reputation system that never really disable. Specifically, it says: "Reputation: * 0" at the bottom of every post and there is still a button to list users by reputation (/users/sort-reputation).
It seems like checking the "Disable Reputation System" checkbox should remove both.
Disabling reputation system only disables privileges tied to reputation like managing threads or content after you gain X reputation, it wasn't meant to disable the whole reputation system. Maybe it needs better wording in the ACP.