[Xastir] Speeding up map processing?

[Andreas Weller]

Hi.
I converted a map for Xastir usage. This resulted in a 4000x4000 px PNG
with abt. 20 MB size.
Processing this with Xastir is rather slow. Is there any way in speeding
up processing this raster data? For example whole germany at 1:50000
level results in a 1 GB GeoTIFF...
How can I convert these big files into smaller tiles which are processed
just in time by Xastir when they are really in view?

Another thing I thought about:
Can I convert the Openstreetmaps data to a vector file format usable
with Xastir?

Thanks you!


Regards,
  Andreas Weller, DF1PAW