These are issues I noticed about streaming Lost Ark with VPN enabled.
Stuttering and frame drops in OBS
I had an issue in CBT3 where if I streamed the game with it already running, OBS would frame drop, freeze and stutter to the point where it’s unwatchable.
The solution is to start your stream before starting Lost Ark and VPN. Setup after your stream is running.
I’m unsure why this happens, but it’s the only solution.
Streaming with Full VPN mode
If you’re streaming with full VPN mode with mudfish or a regular VPN, you have to bind your OBS to your regular network.
Otherwise, I suggest using mudfish’s item mode so that it won’t affect your entire PC.
Some people are reporting that this option is not working with NordVPN.