[BUG] Outbound message scheduler performance degradation

[Psychlist1972]

Applies To
Outbound message scheduling

Describe the bug
Over a relatively short amount of time with sending messages, the scheduler performance degrades. This happens even after the queue has been drained and new messages are sent. It is especially evident in cases where the messages all have the same timestamp.

Easily reproducible by running the client TAEF tests and monitoring output. The delta between the expected receive time and the actual received time climbs into high milliseconds, and then even into seconds.

[Psychlist1972]

Note: This does appear to eventually lead to a service crash.