You run many Drupal test instances on your server, on which you run frequent cron executions? You can relieve it, as we did thanks to the Sleepy Cron module: https://www.drupal.org/project/sleepy_cron

Great session by xjm at #drupalcon Lille 2023. Nice to hear the core reviewer point of view. I'm now thinking about breaking the issue I'm working on into smaller issues (or at least small commits).