I was surprised to find screensaver support still in Windows. And they still have a bunch of screensavers like "3D Text" which appears to still be using the same code from its first release in 1998.

They also seem to have isolated them onto their own desktop, meaning that if a screensaver crashes then the users desktop won't be shown. That broke the official 'Bubbles' screensaver in Windows 11 - and they clearly don't test that stuff, because they released it anyway, broken.