The game is very laggy all of a sudden

This was when I first played part 2 of the minecraft update but basically the game was very laggy and I could'nt play the game because of it being so laggy. It was easy moving around and all. But when I get to my base which is in the sky and only way is to use a scalfolding tower. So for a bit, if I hold down my jump button, i would be flying and it says that im still on the scalfold. Not only that but If I break a block, It would take a while to get that block. Im not sure if its my internet (its very good most the time) or its just minecraft. I would appreciate if someone can look into this. Thanks