You said electron sucked. That might be, but vidcutter, the subject of this thread, isn't proving your point. Just goes to show that who writes the code has more impact than the tech stack when it comes to such tools.
I don't know if all the numbers are accurate but it's true that vidcutter does weird things. I think it extracts ffmpeg to the temp directory on every start for whatever reason (it's not like it's a portable executable, it requires installation so why not extract it then?).
I can't explain why it uses more memory or how they managed to make it look alien despite using QT (so much for accusing electron of not looking native).
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.