Do I need a link cable with the Oculus Quest 2?

It’s well documented in other thread. If most of the Quest 2 users doesn’t know about it I guess it’s not an issue over here.

It might only be due to the combination of Display Port and SteamVR to the headset which causes the problem. AFAIK what we see in Quest 2 is streaming encoded video, that’s why the latency is higher.