UWP is fundamentally broken and the proof is that microsoft's own attempts to use it are pathetic failures. even the calculator is a piece of shit now. it's slow, it's clunky, keyboard input is flaky, drag and drop nonexistent
— Graviscera (@gravislizard) December 31, 2018
On a top of the line computer from this year, Microsoft’s UWP calculator is slower than a calculator program I used on DOS in 1985. No exaggeration at all. And yes, the 1985 program had a GUI (but no mouse support).
The problem with UWP — or at least a major one — is that it’s built using a slow programming language atop a layer that’s sandboxed atop a layer, atop a layer, atop yet another layer that finally gets to touch the OS calls themselves. This is going to be just incredibly slow. And it is.