I downloaded the latest version of the UK map in V4 format and that renders fine on my older Oruxmap install. The map is much bigger than the last UK map I had but has lots of new details including some houses being built near me, they’re not finished yet but are on the map. I also downloaded the latest render theme. I’ve got the following “Elements”, “Elevate”, “Oruxmaps V7” and about 5 or 6 Andromaps themes like Andromaps_mtb or Andromaps_hike.
Indexing into and displaying from a 1.3GB map file on my old Moto G(4g) with only a quad core 32 bit CPU and 1GB of Ram gives it a work out but it’s eminently usable still.