Re: Debouncing slow mode line constructs (was: Emacs design and architecture. How about copy-on-write?)

[Dmitry Gutov]

On 21/09/2023 14:36, Ihor Radchenko wrote:
> What about automatically debouncing slow :eval constructs in the mode
> line? If we make sure that :eval constructs running longer than a
> threshold do not run too frequently, it can certainly improve user
> experience.

Sounds worth looking into.

Though if we just do this silently, it can hide performance problems, 
both discouraging the mode-line authors from fixing them, and creating 
odd behaviors (from the user's POV) when something which should change, 
doesn't.

BTW, most advanced mode-lines (including smart-mode-line, which I use, 
and is reasonably fast) use the :eval constructs pretty much everywhere.