Comment 3 for bug 1848009

Discussed a bit at the gnome-shell hackfest, it's probably because the overview 'download sreenshots' of all the open windows for the overview (which also gets open when you open the app grid, as you can see if you press 'esc' from that view).

Upstream has a branch to remove that 'download' step but it's next-cycle-material

They suggested we could probably do optimize to not load the overview in app-grid-mode if we were after a solution for the current stable serie