The framerate is reduced drastically when looking at a lot of cushions

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it happens, because cushions are entities

Thank you for your report!
After consideration, the issue is being closed as Won't Fix.

Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.

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This performance impact is expected because cushions are entities.

thanks sherlock