I tried to solve this problem in many different ways but with no success. My game basically freezes every 30 seconds , and it looks like a connection problem since i can move but i see the world freezed. I allocated 4 gbs of RAM , I have installed optifine and got 60/120 FPS constantly. My ping is not that bad and my connection neither (300Mbit/s) . When I play single player it's all smooth but asa I join a server it starts to happen. Moreover I did not get this problem 4 months ago and I have not changed pc, nor router. What could it be?