I upgraded to Unity 2021.3.1f1 and now the build is slow.

I upgraded Unity from 2020.3.25f1 to 2021.3.1f1 and now android builds are slow.
With 2020.3.25f1 it took about 1.5 minutes, but with 2021.3.1f1 it takes about 7 minutes.
This project is loading about 20 scenes, and from the build messages, it seems to be taking a long time to load the scenes.
If anyone knows the cause, please let me know.

HEY UNITY!!! PEOPLE EXPECT FASTER, NOT SLOWER SOFTWARE
IT’S SUPER SLOW!!!

from 2020.3.32f1 switched to 2021.3.6f1.
At first, I was thinking ok it’s first built that’s why it is slow.
But nope.
Even rebuilds are slow as hell and some folders “BackUpThisFolder_ButDontShipItWithYourGame” and “BurstDebugInformation_DoNotShip”

Yeah. I have the same issue. Try to use 2021.2.19f instead.

Anyone know why 2021.3.1f1 and even 3f1 builds so slowly and why Unity has not addressed yet?