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 (message from Aaron Jensen on Sat, 29 May 2021 02:06:18 -0700)
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> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Sat, 29 May 2021 02:06:18 -0700
> Cc: Alan Third <alan@idiocy.org>, emacs-devel@gnu.org
> 
> Oh, and even with my config, with line numbers, in a ruby file, I'm
> seeing 60-80ms latency with my measuring app.

Compared to what latency without line numbers?  60-80ms is quite a lot
for redisplay, but I don't really have a clear picture of how that
works on NS.