The game got extremely slow, then suddenly crashed

What I expected to happen was...:
I was expecting it to catch back up and not be so slow and trade with a villager.

What actually happened was...:
I right clicked on the villager to trade, but it got slower and quit

Steps to Reproduce:
1. Switch from render distance 'far' to 'normal'.
2. It may be slow
3. Continue playing as normal.
4. Crash

I just clicked on the report to Mojang button in the new launcher. They told to me send it in for them to see, please don't judge me.