Realtek 8169 drops to 100 Mbps

[p.H]

Note that the proprietary Realtek driver r8168 does not use firmwares in /lib/firmwares. It embeds its own firmware blobs.

[Systech65]

Pardon my ignorance as I am quite new to all of this. How can we determine whether the correct firmware is being mapped/loaded?
Can you please explain?

[GarryRicketson]

These key words:

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On Debian 9 How can we determine whether the correct firmware is being mapped/loaded? 

Copy/paste into your favorite search engine.
There are many results, you should read them.
A good one to start:
https://wiki.debian.org/WiFi

Use lspci to see information about which PCI cards is connected

show the out put of:

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lspci

But don't limit yourself to just that one result, read some of the others as well.
https://www.debian.org/releases/stretch ... 04.html.en
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[p.H]

How can we determine whether the correct firmware is being mapped/loaded?

Check the kernel logs with dmesg for any firmware loading messages associated with the related modules.

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dmesg | grep -i firmware
dmesg | grep -i r8169

Kernel modules usually list firmwares they may need, and the list can be displayed by modinfo.

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modinfo r8169

However it lists all firmwares for all supported devices, not only the one for your specific device.