How to reproduce:
1. Open the attached “IN-42393“ project
2. In the “Project Settings” → “Player” → “Graphics API” add only “OpenGLES3”
3. In the “Project Settings” → “Player” → “Quality” select “Balanced”
4. In the “Build Settings” enable “Development Build” and “Autoconnect Profiler”
5. Click “Build And Run” and inspect the “Profiler” window

Expected result: The Player runs at ~30 FPS
Actual result: FPS are not stable, jumps between 15 FPS and 30 FPS

Reproducible with: 12.1.12 (2021.3.27f1)
Not reproducible with: 14.0.7 (2022.3.0f1), 15.0.5 (2023.1.0b19), 16.0.1 (2023.2.0a17)
Could not test with: 12.1.12 (2022.1.0a1), 13.1.1 (2022.1.0a16) - Gradle failure during building
Fixed in: 13.1.3 (2022.1.0b1)

Testing environment: macOS 13.2 (Intel)

Reproducible on devices:
VLNQA00512 - Samsung Galaxy S9 (SM-G960F), CPU: Exynos 9 (9810), GPU: Mali-G72, OS: 10

Not reproducible on devices:
Galaxy Note8 (SM-N950N, Mali-G71)
Galaxy S22(SM-S901N. Adreno 730)
VLNQA00520 - Galaxy S22 USA (SM-S901U), CPU: Snapdragon 8 Gen 1 (SM8450), GPU: Adreno 730, OS: 12
VLNQA00523 - Galaxy S23 (SM-S911U), CPU: Snapdragon 8 Gen 2 (SM8550), GPU: Adreno 740, OS: 13
VLNQA00277 - Asus ROG Phone (ASUS_Z01QD), CPU: Snapdragon 845 SDM845, GPU: Adreno 630, OS: 8.1.0