Maybe a more subtle loading indicator like a shimmer animation in the background of the tile instead of a question mark (or spinner) could be a good compromise?
Edit: I should also add that I think there’s opportunity for improvement in the load time of Super Tiles. I suspect that we could do some work around caching the Super Tile structure client side which could speed up the perceived loading time. Since it would be cached (and the tile potentially could have been changed), we might still need some sort of visual cue like the shimmer animation above or graying out the content or something of that nature, but I believe the tradeoff would be worth it for the vast majority of cases. Here’s a relevant feature request: