Here an example for file size relation between raw data and decoded data (barrencover shapefile from my lofoten cs):
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BarrenCover:
raw data: 949,0kB
ogr-decoded data: 775,3 kB
and here for SRTM height data, also for the lofoten cs:
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SRTM-3:
raw data: 190,5 MB
preprocessed data: 35,7 MB
and finally for the airports:
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airports:
raw data: 34,1 kB
genapts-processed data: 275,2 kB
so the only data which is more after processing is airport data (note that genapts already included height data!)
[EDIT]Fixed code