When opening selection world screen will get freezed before to load the world

Steps to reproduce the issue

1. Open minecraft selection world screen

2. Then, press a world you like

Expected result

When pressing a world will be not getting freezed before loading the world, but instead would load fast

Observed result

When pressing a world will get freezed before loading the world.

Note:

When pressing a world will get stuck before appearing the ui for loading the world