World takes too long to load

Summary:

I was going to play in my survival world but it was loading so long. After I got in the world I died to a spider because of how long the world took to load.

Steps To Reproduce:

1. Create or join a world.

2. Observe loading speed.

Expected Results:

World would load normally.

Observed Results:

World would load too slow that you could get killed by a hostile mob.