Monterey DisplayLinkUserAgent high CPU with one app

[mdiorio]

Dell D6000 dock, MacBook Pro 15" 2017, latest DisplayLink drivers installed today.

I have an app (available in the App Store), called TacticalPad Coach's Whiteboard.

App works great on my built-in display. As soon as I move it to the external display, DisplayLinkUserAgent CPU shoots up immediately and my CPU fan kicks on. As soon as I move it back to the built-in, CPU drops.

It appears that the app engine is Unity and it directly relates to frame rate. I this app I can set the frame rate. It defaults to 20fps. That yields DisplayLinkUserAgent consuming over 100% CPU. If I set it to vSync, same thing.

Only when I set the frame rate to something like 5 fps does DisplayLinkUserAgent CPU drop down to about 10%. 10fps is roughly 25-30% CPU.

Also fun - when the external monitor is my main screen, the app shows up fine. When the laptop display is my main screen, the app appears as a black screen when on the external monitor, but moving it to the built-in display and it shows up fine.

Any ideas?