Establish IP from DHCP but no Internet or Extremely Slow

Synopsis: Net Macmin, New Ethernet Cat 6 cable (approx. 90 ft), DSL Comtrend Router. IP Connects, slow to no internet.
Added a 90' cable and ends across store basement from front PC to router in rear of business. Standard non-crossover Cat 6 cable properly crimped. Get IP Address from DHCP on front MacMini but internet is extremely slow. I re-ran the cable away from parallel to power conduit, still extremely slow. The light on the port which this cable is plugged in flashes at high rate with no pause, unlike three other connected to router.
Front MacMini works fine over wifi, but retail software recommended ethernet connection to ensure reliability should interference occur over wifi. When I'm testing the Ethernet I do shut off the wifi and have, since started testing, changed the service order so wifi is second chosen to ensure tesitng with ethernet is accurate when wifi is on.
When you try to load a webpage (I used google) through safari it loads 25% of the load bar and stops until it times out a few second later. Used network utility to verify connection to goolge, it took a few seconds longer than wifi but was able to ping google. I don't own a ethernet tester and would rather not buy one for one project.
Based on the ability to connect with IP address tells me the cable is able to talk back and forth with the router, correct? I've read a lot about ethernet port issues, how common is this, what else could be causing the problem?
Internet Source: MyFairPoint DSL for Business
Network Hardware: Comtrend AR-5381u DSL Router
Other Hardware on Router: Second MacMini, Dell Tower, Color HP LaserJet
Thank you to whomever can help and everyone that lends feedback!

My plan is to bring my MBP to the shop later this week to test this out. I wanted to put this out there to see if any other troubleshooting ideas were brought up. Thanks for the input!

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