It's a know fact of the low LAN-to-WAN throughput on these devices. Check out Small Net Builder ...
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www.smallnetbuilder.com/ ··· emid,189Click on the FVS318 review, it's 3rd from the bottom of the list, then go to the performance page. You may want to replace them. In case you have the FVS318G, it's 10th from the bottom of the list.