Inconsistent Internet Speeds on my Laptop

I have a Dell XPS 15 7590. All updates are up-to-date, utilizing the SupportAssist software module. 

My internet speeds are highly inconsistent. Using Speedtest.net, and using Spectrum's speed test site, I get the same results. When I run the test, the result could be 200+ (which is good, since I'm paying for 200), but five minutes later it may be only 49. 

• Results are the same whether I'm using WiFi or plugging an ethernet cable into my docking station (laptop has no ethernet plug)
• My work laptop consistently returns 200+
• My android phone and my wife's android phone consistently return 200+
• My wife's Microsoft laptop consistently returns 200+ 
• I have disabled, waited a few minutes, then re-enabled the device driver for my wireless network adapter, no change  
• I have searched for driver updates for my wireless network adapter - none available 
• Wireless network adapter showing in Device Manager is "Killer(R) WiFi 6 AZ1650x 160 MHz Wireless Network Adapter (200NGW)"  
• Below is a screen shot of my Network Adaptors in the Device Manager window 

Since all other devices are consistently fast, I'm assuming it's my laptop that is the issue.

What advice do you have for me? 

I am running Windows 10, which is also kept up-to-date.

Device specs: 

Device name DESKTOP-OL0AOLT
Processor Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz 2.59 GHz
Installed RAM 32.0 GB (31.7 GB usable)
System type 64-bit operating system, x64-based processor

Windows Specs: 

Edition Windows 10 Home
Version 21H1
Installed on ‎8/‎2/‎2020
OS build 19043.1110
Experience Windows Feature Experience Pack 120.2212.3530.0