After updating our experience on Friday, the 6th of March, 2026 circa. 3:00pm PST, we were monitoring our experiences and I noticed in mine that we’re experience multiple instances of the ‘doRebuildRenderAndInputLists’ MicroProfiler label per second. The label appears to show up at least a few times each second, where the minimum time spent on the work this label represents being done is 6.5ms. In practice, this produces and incredible amount of stuttering and we’ve noticed this in other experiences that we do not maintain as well. The label appears to be produced by and affecting all users, disrupting the playing experience of our users greatly.
Some affected experiences:
The label does purport it’s Group identifier as “UI” but in all cases where the label occurs, there is also a label for FastClusters (what I’m usually watching for) and there is no UI changing, moving, or behaving in such a way that would cause redrawing, rebuilding, or more processing than otherwise needed in the way that this label suggests - so the effort being spent by this label appears to be spurious.