Snap is not all bad if you're on a Ubuntu based distro, I just don't like the way it's pushed and that it comes from Ubuntu mostly. Startup time is a major issue for me also, but all in all it works.

I'm still sitting on the fence, heavily prefer flatpak but when Ubuntu is going to package nvidia drivers in a snap it's a thing I'm up for trying.

My understanding is that if I'm on Ubuntu and the snap uses the same underlying Ubuntu version as my distro it should be fast but I haven't seen it.