I initially wrote it off as my core i3 laptop with Windows being slow but then same thing was happening with my shiny new Windows 10 Core i7 workstation. It's really not cool. It all the UWP apps. The new Calculator opens much slower than the older application also.

It's fast, because it's old

-- State of software, 2020

Apropos of nothing, I will note that pretty much all of Microsoft's testers got laid off in 2014, shortly after Nadella became CEO, and were never replaced. Whether it was in motion while Ballmer was still CEO or not, Nadella still would've had to acquiesce to it for it to happen and bears responsibility.

Maybe it's trying to sign me in to some telemetry service and share my image with Cortana.

At my work I have to look at details on images often. Photos have a zoom button that randomly disappears. And together with slowness and other bugs I had to revert to using Paint for viewing images, since I'm blocked from installing other programs.

I changed the file in Windows 10 so that the old Photo Viewer app was kept active.

Wow, I thought I was the only one too! Ridiculous how bad this damn app is. It just makes me more angry dealing with it now that I will know that it's not just my PC that's to blame.

I really liked the default PDF viewer that came with Win10. But then they killed that.