Thanks for that information and as I suspected that is a 10/100 port so the 90-100 MB/s speed mystery is solved. That is the fastest speed you can attain without one of the adapters from Amazon.
Have an Inspiron 15 3000 i 7 - Purchased November 2020.  Recently upgraded home internet service to 500mbps.  Have Inspiron connected, via Cat 8 ethernet cable, to wifi gateway/internet routed.  With this connection I get 90-100mbps speed.  Connect via wireless and get 450+.  Searching for info on gateway and told all ethenet ports are GE supporting 1000mbps.  Cannot find information on ethernet port for this Dell Inspiron.  Can anyone confirm what type of port and speed it should support for this Inspiron 15 3000?
Inspiron 15 3000 Ethernet Port - FE or GE