Powering multiple pistons simultaneously create frame rate drops compared to previous versions (i.e 1.15-1.15.2) regardless of the type of hardware the client is running on to the point of freezing the game in lower spec hardware. Multiple pistons like piston walls or large and complicated piston and slimeblock contraptions.
Video proof:
Video not mine.
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galaxy_2alex
migrated
I can't really record anything on 1.16 due to it freezing to the point of crashing so I cannot put a comparison footage.
galaxy_2alex
Just a screenshot with those screens enabled while it occurs is sufficient for the moment.
migrated
I updated the description linking to a youtube vid that covers the same issue.
galaxy_2alex
Based on the info provided, this is MC-190891. If you still experience this in 1.16.2, please open a new report.
Please provide a short video visualizing the difference between 1.15 and 1.16, please make sure the Alt+F3 debug screen is enabled while taking the footage.