Did you try just after booting?
If i do my best to close the window
$ time snap run gnome-calculator
Then in a second launch
time snap run gnome-calculator
Then i remove snap and install deb gnome calculator. On the first launch
it’s 7 times faster.
Ok i’ll do a bug report for calculator, vlc, chromium …
But, the post here is not against SNAP but only to say, for everyday users, this is not ready now.