LdrawLoader - quality of model

Hi! Is there a way to changing the quality of models for packing ldr file? Lower level of antialias or thinner edges or something similar?

I always receive big mpd files in comparison with original ldr files.

I noticed strange situation that after rebuilding models (same shape, but less bricks) original ldr file is really smaller, but new mpd file is even bigger than before rebuilding. It looks like I should change something in converting ldr → mpd step.