You can adjust under the QOS tab go to bandwidth and adjust the upload and download to what your ISP is giving you. Other than the IPS function this is pretty much all you can do to vamp up your throughput on the router. Hope this helps.
You can adjust the mtu settings un the wan tab to manual and based on what your internet service is you can use 1492 for dsl or 1500 for cable. Your not going to get the full 100mbps because you filtering through a firewall and that always decreases speed. Try the mtu's and lets see if that makes it any better.
Are you testing your speed being directly plugged into the router or are you going through a switch? If through a switch, plug direclty into the router and test it there. Also check and see the connection speed under the port settings, under the qos tab and verify that it is 100mbs and not 10mbs. You might can turn off the auto negotiation on that tab to see if that increases the speed.
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