mobile users can't scroll comfortable down on my custom style and xf 1.1.4 as long as it's loading pictures in posts of a thread - it's always jumping upwards when next image is loading finished. This happens mostly on a "gallerylike" thread with huge amount of pictures.
in new responsive mode (mostly on mobile phones ) on xf 1.2 when images are embedded in spoilers-bb-codes, they should only start loading into cache/mobilephone, when spoiler is opened. this can save mobile traffic and mobile surfing performance.
Or it should only load images not locally hosted once at a time while in responsive mode. Of course this should be configurable/disable in ACP Options.