I reinstalled windows not long time ago , then updated system to all fresh drivers ->including<- my video card (i using AMD) . After log i noticed that shadows ingame was showing improperly (like some Squares or something like that) also fps when battle against 3 or more mobs was fall to 10~15 , same if someone else fighted with pack of mobs or just "fating" lol . I was wondered whats wrong , tried many things . In the end reinstall Videocard drivers to older ones solved all problems . At least it fine by me since i play only FFXIV and XI sometimes only