How to reproduce:
1. Open the “IN-122139_AddressablesPerformanceBug“ project
2. Open Window > Asset Management > Addressables > Groups
3. Highlight all Addressables assets in “Group 2”
4. Right click on the selection and select "Move Addressables to Group..."
5. Select any group to move the Addressables assets to
6. Observe the time it takes to finish moving assets

Expected result: The task finishes instantly
Actual result: The task takes several seconds

Reproducible with: 2.4.1 (6000.0.40f1), 2.7.4 (6000.0.60f1, 6000.2.10f1, 6000.3.0b7, 6000.4.0a3)
Not reproducible with: 2.3.16 (6000.0.40f1)

Reproducible on: macOS Tahoe 26.0.1, Windows 11 (by reporter)
Not reproducible on: no other environments tested

Note: If you drag and drop the selected Adressables assets into a different group they are moved instantly