When launching minecraft on a multiplayer or solo server, the game no longer responds

I send you this request, following the enormous minecraft, launching the game on a server with friends (or even solo), it is impossible to do anything during loading (construction ground As a general rule, the game does not respond any more, once a day only, I can launch the game, for a few seconds, after which, the game no longer responds.
I tried to create my size, I reiterated the 64 bit version of java, but nothing changes, always in assumptions, I have changed in graphic size of my screen (which is a 3840 x 2160 screen ), Still no results.
Some cause and comment?
Thank you for your reply