As for performance it is pretty good for what it is. My laptop is too old to do much of anything serious anyways, 2011 x220, but with 16gb RAM I don't really have issues with day-to-day use. I can't play full screen youtube which in other Linux OSes will work so there is something about that pipeline that isn't as performant.
My usual use is running emacs and SBCL, no issues there. I give my work VM around 8gb of RAM and that is more than enough.
One nice thing I have done repeatedly, I have written up a server in my work vm, then cloned the vm with all my code in /home, then reduced the ram on the clone to just enough to run some code as a server, and tested it. Once the code is nice and I would then spin up a fresh VM from the same template but without any of the /home files to run it from, copy the right folder over, and run it for a while in long term sort of testing.
As someone who runs VMs randomly for various reasons it is nice to have them integrated into the machine. Before this I was using a Linux box with KVMs and working from within a VM anyways. Having all the VMs update with only a couple clicks is very convinient, as is making backups of them. Having them all display windows within one desktop enviornment is fantastic for such a small screen.
Only annoyance is having a couple extra clicks to pull the clipboard from one VM to another but I got used to it and it doesn't bother me anymore.
Works fine for me. Did you try alt+F11 and giving enough RAM and CPUs?
When saying clicks here I assume you do the copy dance? ( ctrl+insert, ctrl+shift+c, ctrl+shift+v, shift+insert ) It sticks.. nowadays I tend to do that even in Windows.
For me it depends on the specifics of the video, usually ~10 Mbit/s 1080p x264 and YouTube at 1080p is mostly ok, but I don't even need to try 2160p content. (i5-9500T)