I can also confirm this that the long loading issue is related to Visual studio but the UE4 will crash the binary files if you closed the visual studio from task manager and tried to open the open project in the editor if it is from source build 4.26.2.
Happen to me 2 times, and recompiled the engine…
When you are downloading dependencies for the source code the unreal server at cdn.unrealengine.com will not be responsive and will be so many time out errors, you have to download dependencies again and again and when it will be compiled… it needs 110GB of pure free space to succeed, other wise it will failed to compiles.
In short… I have lost 200GB of internet data by just downloading dependencies… other physical brain stress is extra. 