this post was submitted on 20 Nov 2023
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And wouldn't work, given that except for the actual pushing pixels to the screen everything else is done by the Lisp code. So you would need to tightly synchronize the two threads to the point of it being useless.
Having a separate "rendering" thread works for applications where you can queue up rendering tasks and then execute them in the background. Such as a game engine.
Not an interactive text editor that has not been designed with such architecture in mind because threads didn't even exist back in the day.