"SchedulerHostConfig.default" causing unbearable stuttering upon someone chatting in large servers

Description

When someone chats in https://www.roblox.com/games/2872154782/Chechos-Deltarune-RP, the game stutters. The game typically has 150-200 players in a single server. I’ve tracked this down to SchedulerHostConfig.default in the microprofiler. This occurs on every device type I’ve tested on, and happens on many of our players’ devices.

This bug (or something similar) has been reported many, many times before, but I’m re-reporting it, as this is possibly different (it has a different microprofiler label).

Repro

Join https://www.roblox.com/games/2872154782/Chechos-Deltarune-RP (specifically the biggest server), wait 15-30 minutes or so, and watch your FPS stutter whenever someone chats.

Microprofiler Dump

microprofile-20250609-013705.html (9.0 MB)

Extra Info

Our game uses Atomic streaming for all character models.
A copy of the game’s server & client can be provided if needed. I doubt they’re needed though, as we don’t mess with the chat system much (other than styling chat bubbles).

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