Having performance issues in large outdoor locations (Europolis/Marcuria)? Tired of running with near-to-slide-show fps? Instead of lowering video settings, try this genius hack: walk/run with camera pointing up into the sky!
In this "mode" there are significantly less objects in a frame, which means less objects to render, which means less work for GPU per frame, which means less time to render a single frame, which means more friggin frames per friggin second! Balance (and clipping optimization) be praised! I tried this and observed two-fold fps increase in Marcuria and Propast. It may even work for indoor locations.
Of course, you still need to lower your eyes from time to time to not get lost (and inspect surroundings, I presume). But with some practice it may become your only way of (fast) movement. Oh, and the view is still quite nice, btw.