UV Tiles are a way to texture more than one set of textures, across several UV ranges, inside a Texture Set.
By default with a traditional workflow, a texture is repeated over each UV ranges. With UV Tiles, each range become a dedicated texture instead. This workflow allows to virtually increase the general texture resolution by splitting the UVs into multiple range of textures.
UV Tiles currently only support the UDIM naming convention, more will be supported in the future (such as Mudbox and ZBrush conventions).
For further details, see the following pages:
Working with UV Tile projects can be demanding, we recommend using an SSD to improve loading times and general performance. We also recommend setting the cache location on an SSD as well.