Increasing bytesize? What?
Save size could become an issue. It seems like the saves must be using some sort of compression (maybe not saving blank particles, or maybe some sort of rle?), as if they have to save the state of every XRES/YRES combo, that is already (612*384)/8/1024 = 28KiB per bit per particle. If you had a full canvas of particles and had to save the pressure and velocity of every single one, it seems like it could very easily double/triple the save size.