Question How can I resolve big performance hits from ARSession.Update() on Android?

Hi,
We've got a scene setup with MARS to utilize facial tracking. In editor using the sample recordings, it runs pretty smooth. However, when we build to Android, i've noticed in the profiler, we get some pretty major hits on performance relating to ARSession.Update().
Here's an image from the profiler:



There's also not a whole lot of additional complex logic going on inside the scene.
I've read that doing the following two lines would help if this is due to some throttling:

Code (CSharp):

1. Application.targetFrameRate = 60;
2. ArSession.matchFrameRate = false;

However, I can't for the life of me find where to access ARSession with MARS.
Any guidance on this would be very much appreciated.

Edit for additional info:
Unity version - 2020.3.12
MARS version - 1.3.1

Cheers,
azevedco

 

Awesome, thanks for your response CiaranWills!
The device I tested on is the Google Pixel 5.