In reply to Andy Ovens - UKC and UKH:
Just checked and tested a few pages, it is a lot slower to load on the pages with more climbs and also those with several named buttresses / sections of crag.
Phone is a samsung A5 (2017)
Browser is Chrome
Examples: a really slow page is Stanage popular (in fact it didn't fully load, and isnt easier to scroll up and down, and is really laggy with jerky scrolling).
faster page example: Ashwood Dale woth 20 climbs, loaded fast, no issues.