I am Lattrommi. Yes, that one. You’ve never heard of me? I’m not surprised. It is often said that anything you put on the internet will live there forever. It becomes immortal. I do everything backwards and wrong. I do not live forever, I am always dying. ¿|√∞²|?
There is a bug that is open right now which sounds like it might be one you were experiencing or possibly explains part of the issues.
https://bugs.kde.org/show_bug.cgi?id=501073
Like the web browsing might have been from middle clicking, which causes a lengthy hang and resuming from suspend and powerdevil are a prime suspect for it.
The login wait might be an issue I vaguely recall about the splash screen and that disabling it removed the startup hang.
I’ve been exclusively using Manjaro KDE since September of 2021 and the linked issue I started getting a couple months ago and it’s gotten bad enough to make me want to start hopping again.