Hi, the ipsec speed is limited by upload speed at remote site due to ACKs.
Having said that I have issue with SG-3100 - I cannot get greater than 45 Mbps on a physical 100Mbps fiber link to my home pfsense which is 940Mbps fiber, whereas I can 380Mbps+ to a SG-5100 on physical 500Mbps link, and 180Mbps to a SG-4860 on a 200Mbps physical link. My home is a home-built pfsense running i7. I will open another thread on this.