Hi all, I am working on a large scene project (city-scaled between 5 and 10 square kilometers). Everything fits in a x250 scaled Unity plane (so 2500 m x 2500 m). In Unity 4 (Beast), lightmapping takes 20 minutes with reasonables settings. In Unity 5 (Enlighten), lightmapping takes 48 hours ! I know from the discussions around that Enlighten is not that optimized when we deal only with static baking. Is there anything I can do ? (apart fro crying...) I tried all the settings, I tried to split my objects in smaller ones, and nothing works. The only thing that "works" is to scale down the whole scene A very simple test is to lightmap a simple x250 plane with a single directional light : -Beast : 20 seconds. -Enlighten : 23 minutes ! Hello "7/11 Light Transport !" :-( Thanks for any hints !