Connection Timeout Minecraft?

So I have a macbook pro with OS. Mavericks 4GB. I usually don't game, but when I do I play minecraft! I usually can get on a server, but recently during the game I would be kicked out and would display a message, "Connection Timeout." I attempted to allocate more ram, reduce my render and other things that reduce the lag, but I still get the message. Another PC of mine doesn't have this problem. Any suggestions? Also please don't post just to talk bad about Mac! I need some suggestions.