I have a pfsense system BUSINESS B100 - CELERON DUAL CORE J1800 2.41GHZ 4GB DDR3 SODIMM SSD 60GB HDMI. https://www.amazon.com.br/gp/product/B086M2D8DJ/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
I selected the speed for both interfaces:
If I bypass the pfsense using the same USB LAN ether my speed is 300+, go back to the pfsense and it goes down to ~40.
I have disabled most all advanced features like snort and pfBlockerNG and in the advanced/networking have all checked to disable offloading.
On my DGS-1024C all link lights are green indicating 1000 speed.