Nether portal when enter of the dimension will require lot of time to be loaded the dimension

Steps to reproduce this issue:

1. Open minecraft

2. Then, wait to be fully loaded

3. Press play, then select world

4. grab the obsidian block and the flint and steel

5. Then, create a portal and activate it

6. Observe

Actual result:

N​ether portal when the player enter in the portal will need wait a few minutes when entering in the nether dimension.

Expected Result:

Nether portal when the player enter in the portal need wait some seconds before to be loaded the dimension.