It's not just the slowness, but the loss of basic functionality too. Keyboard shortcuts, for example. On my machine, Notepad still seems to have the tradition

It's not just the slowness, but the loss of basic functionality too. Keyboard shortcuts, for example. On my machine, Notepad still seems to have the traditional keyboard shortcuts. But in Paint they are completely missing. Alt-F-A? No Save As dialog for you. Close the app with unsaved changes? You get something like the traditional "do you want to save your work?" dialog, but the left and right arrow keys do not work in the dialog. And you can't type N or Alt+N for "Don't save". These do work in the latest Notepad on my machine. These keyboard shortcuts used to work in every Windows app, and especially in all the standard Microsoft apps. Now it seems to depend on whether the individual developer knows about them.