Sometimes, especially if the ISP doesn't support it, disabling IPv6 support in each network connection is needed. Any new connection will automatically have IPv6 enabled.
It could also be an issue on your Router or ISP. I also had to try a couple of models of USB-Ethernet dongles on my new Lenovo laptop as it has no Ethernet port and WiFi is too variable in performance.
Linux Mint 21.1 with Mate Desktop. I see 21.2 LTS Victoria is just released, but I'll test it on an old laptop.
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