World tracking performance is being affected by resource constraints

Unity Engine
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1

Hi,

I have a bare basic ARFoundation Face Tracking scene that has been working fine in the past. However, since updating to the latest ARKit and ARFoundation (re-building after a year away from the project) and running on iPhone 12 Pro I seem to get a memory leak which will result in a crash after about 1minute of usage.

Unity: Tested both 2020.3.33 & 2021.3.4 latest on LTS
ARFoundation: 4.2.3
ARKit: 4.2.3
ARFaceTracking: 4.2.3

Error:
ARWorldTrackingTechnique <0x104e315b0>: World tracking performance is being affected by resource constraints [13]
Is repeated logged.

Followed by:
WARNING → applicationDidReceiveMemoryWarning()

Then crashes.

2

After some further testing seems to be fine - looks like it was caused by a wireframe system I was using that was creating a new mesh every update. I still get the ARWorldTrackingTechnique <0x104e315b0>: World tracking performance is being affected by resource constraints [13] log but does not seem to crash and memory footprint looks ok.

Thanks.