[cma]

It is very slow and does more draw calls than a modern video game, melting laptop batteries:

https://www.youtube.com/watch?v=hxM8QmyZXtg

Same guy from this video did a series of videos rewriting the renderer in a weekend or so and going hundreds or thousands of times faster, with more advanced unicode/ligature/language support.

[no_way]

The text drawing code isn't using WinUI tho, they embed terminal canvas into something called "islands", so in this case it's not an UI frameworks fault. Besides I have used it on relatively old laptop and it was fine for me, but others experiences might differ.