The box does not share itself. It queues.
Fire one request, then two, then four, then eight. Aggregate throughput does not move: 23.5, 24.4, 24.2, 24.2 tokens a second. Wall time doubles at every step, 6.8s to 52.9s.
Eight callers do not each get a slower stream. They get the same speed, in turn. We measured this on three different models and got the same flat line every time.
Plan for one inference at a time. It is the single most useful thing this tool has told us.