Re: macOS metal rendering engine in mac port

[Eli Zaretskii]

> Date: Sat, 29 May 2021 10:35:03 +0100
> From: Alan Third <alan@idiocy.org>
> Cc: Aaron Jensen <aaronjensen@gmail.com>, 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.
> 
> FWIW, on my Mac I put some timings into the display code and from the
> moment we receive a keyDown notification to the moment we hand off the
> drawn buffer to the system for display takes around 3-6ms, so unless
> Aaron's system is very different from mine, most of that time is spent
> in places we can't do much about.

The question is: is this 3 to 6ms delay affected in any way by turning
on line numbers?  If not, then not only don't I understand why line
numbers affect the latency, I also don't understand how come the
number of faces affects that.