I spend more time waiting for the game to load then actually playing the game before it closes.

When I try to load up minecraft it takes 7 minutes just to pull up a white screen and another 2 minutes for it to say Mojang and start loading and then after I sit for another 2 minutes I can finally play so I go to create a world and its fine for about 5 minutes then it closes or freezes out and I have to go through the process all over again.