Minecraft world Lag!

Whenever I load a world on the normal Minecraft launcher, the in game server lags a lot. For instance, I wanted to go to creative mode, so I entered the command, but I was still on survival. I tried typing, but my text didn't appear. I loaded a different world, and the same thing happened. The weird thing is that 1.8.6 works fine on other launchers, like the Technic, FTB, etc. I have tried to find a bug report like this, but to no luck. So I will leave this into your hands. I have not provided a console log, because the console isn't outputting anything about this lag. It's just lagging behind as well. Hope this gets fixed.