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I think it is using OpenGL.  I recall I tried Metal and it seemed to  break some shaders.

It has occured to me that the 'standard' setting on the opening resolution dialog thing might not actually do anything! :o Ideally I will aim to get rid of this dialog and have resolution switching in-game too.
The quality settings are actually handled in game. I would be interesed to know if the settings on the in-game menu change the performance when switching between high and low? (the menu is the top right button).

Hi Ryan. Many thanks for the feedback. It's appreciated. I spend a lot of development time working on a 2013 rMBP.  I can get it up to 40-60fps. But that is running on low quality, or in a window. I'm certainly surprised a 2017 MBP is struggling! Lets see what we can do to improve things. I have some questions if you have the time to try some stuff out?

- Is it struggling on both high and low quality settings?  ( 'h' and 'l' are shortcut keys to switch between them in-game)

- Do lower resolutions significantly improve things? Similarly how does it run in a window? Or with the portrait mode enabled (in settings). I think alt-enter or opt-enter will swtich between windowed and fullscreen mode when in-game.

QaaS is still in development - optimising and adding more settings for performance is on my list so hopefully as many people as possible who are into the concept can enjoy it!  

Many thanks @leafo!