So this issue has been reported by several of our members.  When members view gallery images on mobile devices, scrolling to view the image information and comments lags terribly.  This happens on both our theme and the default theme, although we have no template modifications on ours.    I've tested it on several image types and image sizes.  It seems that any images that have comments on them will lag when scrolling and sometimes even freeze.  The only time the lag occurs is on the lightbox.  I viewed the same images and their comments without the lightbox and there was no issues with scrolling.  Video below of trying to scroll through a lightbox using an iPhone.

Same here, very difficult to use on an iphone.

Hoping staff have seen this and are testing out some things.  The lightbox is awesome and very streamlined and I'd hate to have to remove it to make mobile browsing smoother.  :(

Bumping since this is still an issue.