Removing the fog does indeed reduce lag, and by quite a margin, even on high end systems. For that matter, it's really buggy. I can see it flashing in and out of existance when looking at it from far away. The console method does work right now, but we can't be garantied that it will work long term, so the devs do need to address this issue.
Also, this has been suggested multiple times. Before making a new thread, you should always make a search to see if it has been suggested before. Supporting existing threads increases their visibility and the likelyhood that a feature will make it in game.