Reproduction steps:
1. Open the attached “IN-137546“ project
2. Build and Run the iOS Player in Development Mode (with Deep Profiling Support disabled)
3. In the Player, open the “Camera” -> “CPU Images” scene
4. Inside the Editor, open the Profiler and select the iOS Player
5. In the Profiler Hierarchy view, search for “ARSession”
6. Observe the CPU time for “ARSession.Update()”

Actual result: CPU time constantly varies from 0.1 ms to over 11 ms
Expected result: Steady, consistent CPU time, varying up to +-1 ms

Reproducible with: 6.3.0 (6000.0.71f1), 6.3.3 (6000.3.11f1), 6.4.1 (6000.4.0f1), 6.5.0-pre.2 (6000.5.0a9, 6000.6.0a1)

Testing environment: macOS 26.3.1
Not reproducible environments: No other environments tested

Reproducible with these devices:
VLNQA00634 - iPhone 15 Plus (MU0Y3QN/A), CPU: t8120, OS: 18.2.1
By reporter - iPhone 16 Pro Max