Bug Sequence too heavy without timeline playback in Unity 2022.2

I use Sequences.
The environment is as follows.

Unity 2022.2.0f1
Sequences 2.0.1

When checked in the Profiler, the Self ms in
UnityEditor.Sequences.SequenceIndexer.RecomputeSequencesValidity
is a very long time because the operation is very heavy, except during timeline playback on the Editor.

This does not occur in the following environments.
Unity 2021.3.12f1
Sequences 1.1.0

Thank you in advance for your help with the above.

 

Having any playable director on the scene now improves performance.
This is so strange.

 

During the update, the following error was missed.
We do not know what this error means, but it seems to be related to this bug.

 

"Library\PackageCache\com.unity.sequences@2.1.0-pre.1\Editor\Core\Utilities\IconUtility.cs"

If you comment out as follows and restart UnityEditor, the behavior seems to be improved.

Code (CSharp):

1.         [InitializeOnLoadMethod]
2.         [ExcludeFromCoverage]
3.         static void PreloadIconsOnStart()
4.         {
5.             //EditorApplication.delayCall += PreloadIconsWithDelay;
6.         }