Before uninstalling the Killer Control Center, try these adjustments and then retest.

* Click the Windows icon
* Type killer
* Click Killer Control Center or Killer Network Manager

* Click Settings
- Turn Killer Prioritization Engine to Off

* Under System Settings
- Turn Advanced Stream Detect to Off

* Click Set Bandwidth Limits
- Set the Download speed according to your paid for connection. Example, I pay SuddenLink for 500MB down. So I set it to 500MB

* Click Apply Changes
* Close the Killer screen and retest

-or-

* Open the Killer dashboard- Quick Settings
* Toggle Off
- Prioritization Engine
- Auto Bandwidth