"Zorin the total different way ..... lol "
Ok Snaps can't be the reason on your system. But did you purge snapd in the right way ? That is just one small question upfront. Zorin 16.2 is installed with a Snap-enviroment standard (just as Ubuntu 20.04 b.t.w. )
I would open Vivaldi once more and check in the settings for 'hardware accelleration" and turn that setting to off. (No accelleration thus)
Reboot and see if Vivaldi has now an improved startup time.