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Re: Emacs design and architecture. How about copy-on-write?

From: Dmitry Gutov
Subject: Re: Emacs design and architecture. How about copy-on-write?
Date: Thu, 21 Sep 2023 14:27:23 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0

On 21/09/2023 14:17, Ihor Radchenko wrote:
And even the "slow" mode-line packages still manage to maintain at least
5fps, I believe.
Nope. 0.2 sec is the delay that is barely noticeable. When "slow"
mode-line packages affect users it is usually much worse than 5fps.
(Though sometimes it is due to redisplay being fired frequently, not the
individual refresh times being too large).

My own experience is finding certain mode-lines that look okay on the first glance, but then after measuring, finding them to be the chief contributor to the lower refresh rate. Those might refresh well above 10fps, but spending 100ms (or even 50ms) on a mode-line is ridiculous.

Delays which are noticeable by humans start at around 100ms for random ones. But if the goal is 60fps, redisplay should finish at below 2ms.

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