Speedtests on Sagemcom using wired ethernet speeds are crippled

I got the new KVD21 yesterday.  No instructions so I just swapped the sim card from the Sagemcon and installed from the app.  All went well.  I’m getttig over 300mps wireless.  Ethernet directly connected to the modem shows 120-150mps.  Ethernet connected in my office after going through the walls and 2 ethernet switches shows a bit less at 90-95.  While ethernet is still much less than wireless the sagemcom was only giving me 30-50mps.  It’s an improvement that I can live with but I still don’t understand how  ethernet is so much slower.