smart tile preloading

[Martin Kolman]

• while moving
  • in direction of travel
  • speed triggers ?

• while not moving/moving slowly
  • 1-2 levels up and down from current position
  • slowly (sequentially ?) tiles around the currently visible area
    • like this, there would be not downloading tiles once the user starts moving/zooming/panning
    • should be aborted once significant moving/panning starts

• should this be ON by default ?
  • quite a few not-needed tiles will be downloaded
  • larger data transfers