For me, switching to a different approach made a noticeable difference instead of fiddling with built-in Finder connections. Lately I've been using
ftp for mac through something like CloudMounter, which mounts the server right in Finder like a local drive. It feels way smoother for browsing and transferring files without the usual Finder hiccups, and in my experience uploads/downloads go quicker because it handles the protocol more efficiently. Nothing fancy, just personal preference after trying a few options, but it saved me headaches on bigger jobs.