visual glitch/bug

As you can see in this clip (https://clips.twitch.tv/VastDifferentMetalCorgiDerp-jbUWxRFv8KPHOOps), huge visual bugs appear. So far, this has only happened to me in streams, and I have no idea what these bugs could be caused by.

short summary for those who cannot/do not want to see the clip:
everything begins to lag. in chunks, random things are loaded in a few fractions of a second, hunger, armor and life bar flash wildly, coordinates lagging away, xp bar laggs, hotbar laggs. 

later I noticed that the inventory, when it is opened, also lags around.

 

(translated with google translator and re-read by myself)