Steps:
1. Open attached project
2. Open "Explorer -> Window" from menu
3. Press Replay
4. Take a look how much time it takes to do 300 random asset selection
==> 2022.2.0a1 is much slower than 2020.3.23f1 for the same operations

P.S: What it actually does is
Selection.activeObject = AssetDatabase.LoadAssetAtPath<Object>(Path);
with the random Path from Project Browser, 300 times with a small delay between calls

Take a look into attached movie for details