I have the ONT connected to my refurbished Linksys 1750 (https://www.linksys.com/us/p/P-EA7300/), which came highly recommended to use with Fios, and connected via ethernet to my PC with a gigabit LAN card.
Is there anything I can do to troubleshoot? I am still very content with the speeds, but I don't know if my choice of router, especially a refurbished one, could be a bottleneck. Thank you!
I assume you are testing to speedtest.verizon.net. If not, try that first.
If so and still bad, try connecting PC directly to ONT bypassing router.
Also verify that you have hte latest drivers for your ethernet card.
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