Very slow Sidekiq issue with large queue due to massive numbers of unread user notifications

Update: Still running slow and the queue is building up. See a lot of postmaster processes via ‘top’. ~85% total cpu usage (32 cores), the vast majority of that being from postmaster. Which is interesting, as earlier today the cpu usage was 20-35% (sidekiq was still moving slow at that time also). Related: Postmaster eating all CPU

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