Network connection speeds materially different between Surface Pro and Mobile vs. Mobile Only

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I am experiencing poor internet connection speeds while tethered (wifi) to my iPhone. www.speedtest.net on Surface Pro 6 shows sub 1mb download / upload speeds, while www.speedtest.net on mobile shows near 100mb download / 12mb upload speeds.

Circumstances:

• Surface Pro 6 (Up to date excl May feature release) - and iPhone 8 IOS 12.3.1
• Current service provider is reporting that I am within data limits of my plan
• Directly connecting iPhone to Surface via USB cable fixes the issue

How do I improve the internet speed on my Surface Pro 6 over WiFi?

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