If I recall right, Windows 8 and Windows Phone 7/8 during the 2010's were all developed on low end devices.

Both had huge issues UX wise, specially desktop, but performance and stability was never a issue.

Developers should always test their system on the minimum system requirement that they allow the system to be installed...

I remember I complained about WinUI performance years ago, and they told me at the time that "performance" was not the focus...