I do not know with what Mängein to start. Battery after 20 minutes and 10 minutes YouTube Asphalt racing game shrunk to 1 hour. Asphalt has a lot of stuttering, stuttering all the time. WiFi comes and goes very poor reception. Full HD video stuttering. Screen Brightness very dark but good resolution. Comparing the Medion s 6214t detachable a super bright display super battery life to 7-8 hours due 2 batteries. the screen from Medion was also a 15.6 incher, but much larger than the Lenovo. So to be honest I'm disappointed with this ultrabook. Would have a 3 i expected more. I give 1 star because the sound really great sound. Buys this Ultrabook not, the last scrap !!!!