Wayfarer has nothing to do with your download speeds, I'm afraid. What is your FTTH device? If it comes with 2.5Gbps ports, do you connect MorphOS machine directly or through some switch/router? Auto-negotiation could be falling back to 100Mbps for you for example.

Here's 2 things you could try:

a) see https://wayfarer.icu/faq / "How can I use a VPN for geo-blocked websites?" and configure a local ssh proxy on some linux/windows (with WSL) machine if you have one (must be done locally)

b) enable logs: in a shell type
ed boot:bootinfo.txt
locale the booot &device... line and add ed=init at the end of it. save
hfssetmacboot boot:bootinfo.txt
(don't forget that line or system won't boot)
reboot and get the system log with the Debug screenbar or LogTool, send it to me or paste it here