They are a direct response to the GP post's offhand quip about Electron. GP found the difference relevant, and I believe you're GP, but I am confused now given the change in interest.
My point is that startup time may not have anything to do with the GUI. It is not a good metric. I could write both an electron and pyQT app that takes minutes to start if it has other shit it needs to be doing. I haven't used electron in years but pyQT apps start up instantly, therefore this app must be doing something else.
If the two apps were programmed identically then you might have a comparison.