watching this issue as it's something similar to what I'm seeing. Are you seeing the resolution of the DNS take a while before fetch then kicks into gear? How is your DNS setup?
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Show posts Menu$ fetch -o /usr/local/etc/pkg/repos/mimugmail.conf https://www.routerperformance.net/mimugmail.conf -v
resolving server address: www.routerperformance.net:443
SSL options: 82004854
Peer verification enabled
Using CA cert file: /usr/local/etc/ssl/cert.pem
Verify hostname
TLSv1.2 connection established using ECDHE-RSA-AES256-GCM-SHA384
Certificate subject: /CN=www.routerperformance.net
Certificate issuer: /C=US/O=Let's Encrypt/CN=R3
requesting https://www.routerperformance.net/mimugmail.conf
remote size / mtime: 109 / 1610018598