Also you have to wait for the world to render, then you should get a smoother FPS, I mean c'mon everyone's computer should be able to run minecraft ffs!!!!'
It could just be your Internet, it looks like it's streaming the game to someone so if your Internet is bad then you'll have poor gameplay, I would suggest downloading it if that's possible.
This isn't your average CoD game, you may have to watch some tutorials in order to know what to do, I know I had to, but once you figure out what you're doing you'll love it!