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I have a very specific problem. I am trying to build an offline map on leaflet, rhomobile(based on ruby) and OSM data. The problem is that I am making now a offline layer images folder with the city data rendered and in average a big city is 200mb . In case that OSM data file is only 5mb .

What is the optimal way to do it less? Maybe geojson or something else?

I know for Tilemill you can export data to .mbtiles which is sqlite3 database, but the weight of the file is the same and even bigger ... What you would suggest?

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Do you need the performance provided by pre-rendered tiles or can you live with rendering on request? – underdark♦ Jan 3 at 22:12
both is OK. But I need to reduce my App size on device from 200mb to something like 50mb at least – MR.GEWA Jan 3 at 23:28

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