Freeze in loading resources

Could someone fix this bug. Sorry for my grammar in advance its not my native tongue or anything. but this is what's happening when I tried to open my world. Whenever I tried to open my world, It's stuck in loading resources and a min after or a few seconds it will start to lag my computer as heck until my computer freezes. ( Sometimes I was able to open the world but 5 minutes after that it will freeze again and poof lag again freeze of death. )