By removing the IP addresses you also removed information relevant to your network.
FYI:
https://www.lifewire.com/what-is-a-private-ip-address-2625970#:~:text=The hardware within a specific,is used for the communication.
Private IP addresses are used by thousands of home and small business networks.
What you do not want to reveal is the Public IP address assigned to the router via your ISP.
That address can be found by you using tools such as "What is my IP?".
The whole of "ipconfig /all" will often reveal conflicts and misconfigurations regarding IP addresses.
Revealing, for example, that two network adapters are enabled at the same time. There should only be one network adapter enabled barring some special circumstances or requirements.
There are those who are concerned about revealing MAC/Physical addresses. For the most part that is not something to be concerned about. MACs are useful in that they can be used to help identify a device by the manufacturer's portion of the MAC.
If you have router make and model X and the IP address is not consistent with the expected IP addressing then that can indicate a problem. Some caution is needed because end users can change such things and do so. However, it is very easy to make some errors of omission or commission while doing so.
All the more so, if someone has done a factory reset on the router. The router may (via the default login name and password) be wide open for others to access the network. Especially via wireless.
= = = = Regarding your "ipconfig /all" = = = =
One immediate issue is the 40 minute lease time for IPv6. Although the lease time should not make a difference a longer lease time is more commonly used. My recommendation is at least one week if the router (modem/router) permits.
On the otherhand, IPv6 can be problematic and disabling IPv6 is one way to solve or eliminate some problems. You could start with disabling IPv6.
Leaving IPv4 intact for the network devices to use. IPv4 is shown using a 48 hour (2 day) lease time.
The default gateway is also important to know. It could be your router or some other device. Likewise for the DNS Servers. My router is 192.168.1.1 (Linksys) and very commonly used. I use Google's DNS servers at 8.8.8.8 and 8.8.4.4 - also commonly used.
The network adapter configuration is important. Speed and Duplex should be set to Auto allowing the network devices to negotiate the speeds. Changing to some particular settings can and does cause problems.
Bottom line being that the performance cap may be configuration related and not necessarily solved by a USB network adapter.