This occurs for the GameIcon cards as well, but its especially odd for the thumbnail cards as the first thumbnail is already loaded so it should be able to just show it immediately.
Expected behavior
I would expect the first thumbnail, and game icon to already be displayed. With the thumbnail carousel not noticeably being inserted into a ScrollingFrame as it should already be there, with it at least having the thumbnails blank initially like is done for the game icon.
Thanks for reporting!
The first thumbnail is actually not necessarily loaded yet as the homepage uses the “Homepage thumbnails” (can be personalized) and the details page uses the “Experience Details Page thumbnails”.
However, we will try to improve the loading speed of the media carousel to prevent the shown behavior (where it pops in after the page loads).
Just wanted to ask as this is somewhat related, but is there any chance the large screen layout for the game page will come back?
As there was a different layout for large screens that was added shortly after the Universal App launched that was quite nice, with the description on the left, and thumbnails, social links, etc on the right.
Sorry for the late reply. Currently we don’t have plans for updating the layout back to two-column, but thanks for your feedback! I’ve forwarded it to the team.
P.S. I will close this issue as it is technically not a bug (it will always have to load in as they are different assets from the homepage), but we are working on improving the loading speed. Appreciate your report though 
