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Is Emacs buffer scroll/redisplay slow?


From: Fabrice Popineau
Subject: Is Emacs buffer scroll/redisplay slow?
Date: Sun, 19 Jan 2020 10:34:07 +0100

Hi,

Out of curiosity, I timed 'emacs -Q' scrolling through an elisp buffer: I started the timer 
by hand and scrolled down for 1000 lines and it took 45s on Windows/WSL 
and 35s on Windows/native.
This is on a pretty decent laptop (core i7, 32Gb ram, 4k display)
I don't care about the difference here, but overall, 
I find it pretty slow. Is there something that could be done to enhance it?
What is the main bottleneck here?

Best regards,

Fabrice

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