as pointed out by Jonkon this does the trick.
“<image image=”@@preview_rect_image" default_image=“@@default_preview_rect_image” x=“0” y=“0” w=“1280” h=“720” textcolor=“@@preview_rect_color”
keycolor=“1” ignore_keycolor=“1” bg=“1” />"
Actually, i don’t think its backdrop who slows down the hub.
but big thumbnails…
Infact, the hub draws the same thumbnail twice, for the focused and unfocused ones…
That’s explains the slow down, the bigger your thumbnails are, the hub takes more time to display them, as it draw them twice.
