I wondered if that was it, but a 1/RTT loading behaviour seems safe enough to me -- after all, that's exactly what TCP does, and you're presumably not seeing an

I wondered if that was it, but a 1/RTT loading behaviour seems safe enough to me -- after all, that's exactly what TCP does, and you're presumably not seeing any uncontrolled oscillations from that. I guess it depends how much minimizing the size of your connection pool matters.