Im not sure about this, cause I dont have any lags when writing raw data only. Also with a resolution of 500 and orbits > 200 i do not have any lags when writing raw data. But whenever I activate the visual scan with resolution > 300, I got lags. I had the same effect on 3.34 and its reproducable. I dont know if this matters, my raw data will be stored on a very fast SSD. Do you know why the ISAMapGen crashes when generating maps with 36000x18000 pix? I tried this, cause of this would be the maximum resolution of the map and every pixel would be 0.01degree, but everytime I try it, the exe crashes. Another question about the csv, the raw data stores every dot twice or multiple if it's passed more than one time, right? Did some more test on mun now. Okay, it's not the optical scan or the raw data. I tried a resolution of 500 with an orbit of 300. When scanning optical only I do not have any lag. When writing raw data only, I also do not have any lag. But whenever I do an optical scan and writing raw data, it's lagging like hell. To do both at once, I need to take the resolution down to 250, then I'm able to do both at once without loosing performance.