Metro last light redux on 8850m\840m\940m

Laptop: Dell Inspiron 15 5537 Core-I7 4500U, 8GB RAM, AMD Radeon 8850m(2GB VRAM) without recording its +2 or 3 FPS extra.The stutters are due to recording without it it plays good. Min FPS:20 Avg FPS:25 I choose this level because it is this level which had most FPS hit in other parts the game hits constant 30 FPS and more. Metro: Last Light is a post-apocalyptic-themed, first-person shooter video game with stealth and survival horror elements. A sequel to the video game Metro 2033, its story follows Artyom, a Ranger living in Moscow's metro system after a destructive nuclear war. Tasked with finding the mysterious Dark Ones, Artyom must venture to different parts of the metro system, and the surface filled with radiated gases, and fight against different factions and mutated monsters. The game improves on various gameplay mechanics of 2033, and introduces elements such as weapon customization.