> immediate mode may actually be more performant compared to retained mode. Go to any web page and resize the browser window, and you'll notice that the browser is very slow to do the layout and eats a lot of CPU doing it. Resize a window in egui by contrast, and you'll get smooth 60 FPS at no extra CPU cost.
The key part there is no EXTRA cost. Most immediate mode GUI libraries redraw 60 frames everytime, so there is a constant somewhat high cost, especially compared with a retained mode program.
Immediate UIs, without some partial retained backing, are going to redraw all the time. Especially on mobile devices, this can be a huge power suck
Chances are, if you've seen a movie with any CGI, or played any 3D game, in the last decade, Qt was a major component in making it happen.
Qt also powers the Tesla screens, and most KDE apps and Krita.
Although that is years old and perhaps not impressive
Aren't they strongly walking back on the first part?