I wll put my own .02 c here. What is most... awkward for me is no caching. 
OSMand doesn't cache nearest neighboring[1] screens and not even areas 
viewed several seconds ago.

Try moving half a screen with your digit and moment later move back. 
Displayed back areas are rendered from null. It would make sense with 
constantly updated on-line maps but with offline data?

Even with plethora of data in OSM building cache on even middle grade 
phones/tablets shouldn't be problem.

[1]
in below example assume '5' is your current screen. As soon as possible 
OSMand should load 1-4, 6-9 to memory and prepare for instantanous display.

123
456
789

Strategy could  be modified in certain situations, eg. when in navigaton  
mode 'current screen' could be '8'.

m.



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