The biggest problem I have isn't draw distance, but draw lag. It seems to depend on the feature (biological or geological), but I most frequently notice that I've flown right past fungoida fields. If I'm having a hard time finding fungoida, I either fly quite slowly to give them time to load in, or regularly do 360s. Once loaded, however, I find the draw distance to be quite substantial. I'm often able to see fumaroles from a km or two.