It appears to be streaming the data in and out to reduce ram load. On my desktop it was very laggy and had no detail for 2-4 mins and from then on I can zoom in

It appears to be streaming the data in and out to reduce ram load. On my desktop it was very laggy and had no detail for 2-4 mins and from then on I can zoom into any area and wait a few secs for the data to overlay. GPU usage is very high while rendering.