Have you tried multiple devices? Ideally with different operating systems to rule out software/ hardware issues?
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Yes. Windows (7-10), Linux (22.04 Ubuntu, Debian), modern Android smartphones, the latter two of which using either the VPN of the device or the router that usually services all three, it's all the same. I've tried four or five different routers, which is where I get the biggest variance between the oldest at ~30 Mbps and the newest at ~60 Mbps. 99% of the time I'm using Nord, but I have tried Proton (free) and it's similar, within a margin of error.
have you tried mulvad?
I have not.
try mullvad with wireguard. looks like you've tried everything else. =) and openvpn is well known to be a shit protocol for performance.
How are you connected to the network?
Usually via one of the many routers I've mulliganed to try to eliminate that variable, but occasionally via in-phone or in-laptop (usually Nord) VPN apps. During travel, rarely by router VPN (though I have tried it).
Are you using OpenVPN with these providers? And if so, have you tried switching to WireGuard if it’s supported by the provider?
Yes, and no I have not.