The next version of Steam Link for macOS is now available as a beta build.

You can opt into the beta on TestFlight by clicking on the link here:
https://testflight.apple.com/join/Cye7Gfyy

New in this build:

• Steam Link is now a universal native application
  
• Added 59.94 FPS as an available framerate limit
  
• Reduced frame drops when the framerate limit is set to automatic
  
• Fixed overloading the client video decoder when unlimited bandwidth is enabled