There was a recent release or flag change which introduced a performance regression for text rendering.
Default ingame chat (which uses various text layout methods) now occasionally has spikes of around 6-10ms.
TypesetterDynamicDEPRECATED methods are significantly slower than they were before.
How recently is “recently”? Several weeks ago we enabled the new typesetting pipeline which is faster in almost all cases except for a couple of pathological cases. Last week we tried to turn on another change which ended up having to be turned off.