See PHI510. An install reports that mentioning ~80 objects in a task description takes more than 30 seconds to save. The install has ~1 second of Herald rules for tasks and ~2 seconds of Herald rules for revisions and evidence points at this just being a lot of time spent performing rule evaluation in Herald.
Currently, we run Herald against an object when it is mentioned elsewhere. For example, if you mention `T123`, we'll go run Herald rules on `T123` in the process of adding `alice mentioned this in T456.` to the timeline. On this install, this is why you'll often see Herald add subscribers after something gets mentioned.
This behavior doesn't feel good to me: I don't think users really want it, it's sort of confusing and unexpected, and (upstream) Herald rule results never change based on mentions. I've leaned toward removing it purely on the grounds of it not being very desirable as a behavior. Since it's also creating some flavor of scaling pressure here, I'm going to remove this behavior and stop firing Herald rules when `alice mentioned this on T456.` is added to a timeline.
See PHI496. Multiple users have now reached the maximum level ("Heavy Wizard") on their Support characters, and we're overdue for an expansion pack to add new adventure content.