[Feature request] Tiles caching

[mzeddd]

Topic starter is asking wrong question under right caption.
#10

The page load is slow because tool has to download tiles once again every time
And total time it spends in CURL is almost equal to complete execution time.

Here is small timing data:
url: https://tile.openstreetmap.org/9/263/184.png - 0.2480480670929
url: https://tile.openstreetmap.org/9/264/184.png - 0.24392104148865
url: https://tile.openstreetmap.org/9/265/184.png - 0.24472713470459
url: https://tile.openstreetmap.org/9/263/185.png - 0.24587512016296
url: https://tile.openstreetmap.org/9/264/185.png - 0.2441189289093
url: https://tile.openstreetmap.org/9/265/185.png - 0.24409294128418
url: https://tile.openstreetmap.org/9/263/186.png - 0.24702787399292
url: https://tile.openstreetmap.org/9/264/186.png - 0.24497199058533
url: https://tile.openstreetmap.org/9/265/186.png - 0.24390411376953

getImage()-savePNG: 2.3367168903351

So, the right question is: Can you add possibility cache tile files in some user defined directory to speed up generation process expecially if user play with the same area again and again?

Thanks in advance.