Slow upload speed on ZyWALL 310

I have an issue with a slow upload speed on a ZyWALL 310. I have gigabit fiber and when testing the speed I get over 900 mbps download, but only about 100 mbps upload. When connected directly with my PC to the FIOS modem, the upload speed is over 900 mbps.The firmware on the router is 4.31. Does anybody have an idea how to improve that?

Thank you

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