URP Editor and Player perform worse than identical Built-in projects

How to reproduce:

1. Open the “Performance_BuiltIn_Project.zip“ project
2. Open the “Scene_3cameras“ Scene
3. Enter Play Mode and maximize the Game view
4. Observe the FPS counter at the center of the Player
5. Repeat steps 1-4 with the “Performance_URP_Project.zip“ project
6. Compare the results

Actual result: URP project performs significantly poorer (about 30-40% degradation)
Expected result: URP project performs slightly worse or is as performant as the BuiltIn project

Reproducible in: 2023.1.0a1, 6000.0.70f1, 6000.3.11f1, 6000.4.0b12, 6000.5.0a9

Reproduced on: Windows 11 Pro (25H2), macOS (26.2 Arm64), Linux (custom)
Not reproduced on: No other environment tested

Notes:

• Reproducible both in the Editor and in the Player as well
• Better results are yielded when the Editor or Player is placed on secondary monitors (locally happened, likely due to differing resolutions of the screens)
• For example, on 6000.0.70f1 in Editor, the Built-in RP project yields ~950 FPS while the URP project yields ~600 FPS (-37% as performant)
• Reproducible with Vulkan, DX12, and OpenGL