Dear BillTheDBA,
Thank you for contacting Intel.
I understand you have upgraded your network card from 1 Gbps to 10 GbE speed. Please make sure you are using a CAT 6 or 6A network cable. You may also try to connect to another port and see if it can improve the network performance.
You may refer to our website for the cable requirement for 10GbE connections here.
I hope this is helpful.
Sincerely,
Sandy