That solved it, but what does EagerBulkExecution do? And was it disabled by default up until last week? Because this has never happened to me previously.
It is a very specific mode of rendering only really used in the thumbnailer. It forces a few fixed-step updates in certain subsystems prior to taking a screenshot for the thumbnail. Particle systems perform a few sim steps so that you can see the particles on e.g. item thumbnails.
It’s only exposed because all the settings in the code are on the same list (part of our class reflection system), and we didn’t care enough to hide it.
You probably turned it on accidentally, thinking it might improve performance.
Don’t, it does the opposite.
No, neither @Partcline nor I ever messed with the rendering settings in Studio. He just messaged me after getting home one day, telling me that particles were suddenly a lot faster than what they used to be. I didn’t even know it existed.
Exit Studio, go to c:\Users\{you}\AppData\Local\Roblox and remove (temporarily move somewhere) all GlobalSettings*.xml files, then start Studio and open the settings dialog. It’ll have reset to False, which is the default value.
You can then set it to ‘on’ and repeat the above procedure to see it again correctly revert to the default.
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