Lag

Hello team!

I started to play Minecraft more often recently. Everything has been perfect till the last update. 

Here's what's happening (in creative mode):

1. When I point to a block, it doesn't act like it's supposed to be (I can't see the shape of it and I can't do anything to it).
2. When placing a block, it does place but it doesn't (the block is there but it shows after 15-20 seconds after the right click)
3. When opening the inventory, the game blocks and it I got to wait 5-10 seconds till the inventory appears and I can continue my game)
4. The game just blocks(doesn't crash tho)

These are the bugs that I've experienced till now.