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

[Dmitry Gutov]

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.