Creating a test course with enough overrides to trigger this slowness is cumbersome and the performance improvement should be clear from code logic, so just confirm the notifications still work as intended for groups (which is covered by unit tests).

For completeness I've included modified testing instructions from MDL-79718:

Test that group notifications still work as intended

1. Log in as a teacher.
2. Create a course and enrol a student (student1).
3. Create a new group (group1)
4. Assign student1 to a group (group1)
5. Create a quiz with an open date one day from now (48 is the threshold).
6. Go to the quiz.
7. Go to More->Overrides.
8. Add a group override for group1 and set the 'Open the quiz' date one week from now.
9. Run this scheduled task to queue the open notification task:

   php admin/cli/scheduled_task.php --execute=\\mod_quiz\\task\\queue_all_quiz_open_notification_tasks

10. Run adhoc tasks:

    php admin/cli/adhoc_task.php -e

11. Log in as student1
12. CONFIRM that you do not have a new notification for the quiz opening.
13. Log in as the teacher
14. Adjust the override date for the group to one hour from now.
15. Run the scheduled task again (see above).
16. Run cron (see above).
17. Log in as student1
18. CONFIRM that you have a new notification for the quiz opening.

Code verified against automated checks.

Checked MDL-85764 using repository: https://github.com/bwalkerl/moodle

• MOODLE_405_STABLE (0 errors / 0 warnings) [branch: MDL-85764-quiz-notification-MOODLE_405_STABLE | CI Job]
• MOODLE_500_STABLE (0 errors / 0 warnings) [branch: MDL-85764-quiz-notification-MOODLE_500_STABLE | CI Job]
• main (0 errors / 0 warnings) [branch: MDL-85764-quiz-notification | CI Job]

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