@DemoNIck:
Any packet loss appearing on the graphs is ONLY due to p2p traffic. Now I am almost certain that this "packet loss" has nothing to do with the pfSense system itself
Excellent. I suspected this was the case. Now some simple traffic shaping ought to tidy things up so that your high priority traffic isn't impacted.
@DemoNIck:
But before we do so could you be so kind and be more specific on the "WAN saturation" indication.
I apologize for not writing more clearly. I have a bad habit of thinking faster than I type. ;)
By "WAN saturation" I meant the outbound bandwidth utilization on the WAN link reaching or near 100% [due to p2p traffic]. It has been my experience that retail WAN technology (POTS, DSL, Cable, etc.) is subject to extreme performance degradation (i.e. packet loss, etc.) under high bandwidth utilization conditions. When sustained bandwidth utilization exceeds 80% then smaller traffic bursts start hitting the "artificial" bandwidth limit imposed the Internet service provider (ISP). When traffic hits that artificial limit, the ISP begin to "rate limit" the traffic. Often their rate limiting is very "brute force" by simply discarding packets thus creating all sorts of timeouts and retransmits.
Although you never specifically mentioned the bandwidth of your connections, I know from experience that most Internet connections are asynchronous and so are highly sensitive to outbound traffic (i.e. p2p). Your WAN traffic graph shows periods of intense outbound bandwidth utilization with "wan-out-pass" reaching 742kb/s which is at the limit of the most common outbound speed (768kbps) so WAN outbound bandwidth utilization became the primary suspect especially since the rest of the graphs have values in reasonable ranges.
@DemoNIck:
Once again thank you in advance for your time and effort.
It's been my pleasure. Thank you for creating an interesting topic.