У вашего броузера проблема в совместимости с HTML5
The performance with the last current update 1.4.0 in Dying Light on the settings shown in the video is more playable (but can be better) without recording i get 51 FPS on average inside the city and a minimum of 31 FPS when looking to some areas.
Gpu Driver used in this video: Catalyst 14.12 Omega.
Pc:
Cpu: Amd Fx 8350 @Stock
Motherboard: Msi 970a g46
Gpu: Asus R9 290 Directcu ii Oc Edition 4gb Vram Gddr5 512bit
Ram: 8gb (2x4gb 1600mhz)
Hdd: Seagate Barracuda ST1000DM003 1TB 7200rpm 64MB Cache
Psu: Thermaltake Tr2 600w 80+ Bronze
Os: Windows 8.1 Pro x64bit
Monitor: Acer g205hv 60hz 900p (1600x900).