When a featured image is used, but it's random, it'd be great to have it stick around for a while. RAIS (and probably any other tile server) will cache tiles pretty effectively, but only when the same tiles are routinely requested, so having the same featured image for a whole day will improve the performance of the tile server.
When a featured image is used, but it's random, it'd be great to have it stick around for a while. RAIS (and probably any other tile server) will cache tiles pretty effectively, but only when the same tiles are routinely requested, so having the same featured image for a whole day will improve the performance of the tile server.