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Bug
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Resolution: Unresolved
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None
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1.16.2, 1.16.3 Release Candidate 1, 1.16.3, 1.16.4 Pre-release 1, 21w06a, 21w10a, 1.17, 1.17.1 Pre-release 1
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None
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Confirmed
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Performance, Structures
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Low
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Platform
When having a ton of Structure Blocks or a single one with a large size set, turning on Show Invisible Blocks mode for them will tank the fps down to potentially single digits. Even when using a smaller size for Structure Blocks, the performance impact is still very noticeable.
For the test below, I setup a superflat world with mob spawning turned off. Then I placed a single Structure Block and set the size of it to 48x48x48. Then I clicked Show Invisible Blocks and my fps goes from 350+ down to just 5fps.
Here's the streamable link as the video is too large to attach directly to this report:
https://streamable.com/ghygfp
Also attached below are pictures to show the issue if the video doesn't play.
I have tried looking to see if this was reported already and was unable to find another report. Just mark this as duplicate if there is another report but I am fairly certainly this issue went unreported for a very long time (I recall experiencing this issue in 1.15.2)