For years now I have been keeping all buildings as a separate transparent
gmapsup /img  giving it a higher priority/draworder then my normal maps - It
has speeded up my daily runs without loss of detail - same could be done for
rivers/streams etc.
As a bonus I can ,if I wanted to, switch off/on buildings on my device, bit
like contours.
I update my buildings.img when necessary.

This is not an answer to the initial problem but it works

r

Nick



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