Yes, these are XAML files! Here are some suggestions:
If you are not dependent on the Design view (I never use it), I would open the XAML files as txt files so that they do not need to be compiled, which should help.
Right-Click on the .xaml file in Solution Explorer Open with.. Select Source Code (Text) Editor Click <Set as Default> button so you don't have to do it again. Click <OK> button
When VisualStudio really pissed me off with XAML slowness. I am switching to Kaxaml . It is free and super light weight.
I also leave Windows Task Manager open and periodically kill XDesProc.exe (Visual Studio Visual Studio XAML design processes) when they appear. Probably, you just need to write a powershell script or an application that kills them .. (should be quite simple, create a timer and expire and kill it)
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