so i afked over night to get iron as i was low on it and needed some iron for my item sorter and then my game was so laggy i couldnt even pick up a block so i restarted my laptop and tried to get into my hardcore world but it just wouldnt work it would work for about 3 seconds then it would crash and i couldnt do anything. i even made a new world and it was working perfectly fine but ive tried about 10 times trying to get into the hardcore worl but it just wont work. Help!!!