Microprofiler is reporting 200Ms+ from "Write Marshalled" when reparenting an object with a script in

[hya123456h (KingBob)]

"Write Marshalled" lag spikes in microprofiler

[image] Here’s a profiler dump This is causing all sorts of lag spikes and it appears to call “attemptTranslation” and “Text Shaping+Layout” over and over and over again. We use custom localization, and We only use Localization service for RobloxLocaleId, so that’s why we assume this must be an engine bug? Any insight into what this could be? Like here it’s apparently taking 84 ms [image]

Studio gets lag spikes after searching explorer, modifying multiple instances - microprofiler accuses "LegacyLock" and "Write Marshalled"

After searching through the explorer and modifying a big number of instances, Studio starts having lag spikes which happen in a consistent frequency and last until the place file is closed and reopened. Upon checking the microprofiler, the largest labels near the spikes are Write Marshalled and LegacyLock. The bug happens consistenly whenever I do the following steps: Open a place file with a big number of instances in Workspace (repro place attached below); Search the Explorer for something …