How to reproduce:
1. Open the “TestFPSURP“ project
2. Make sure you are using the “Default” layout
3. Open the Game view window and enable the Rendering Statistics window (“Stats” Button)
4. Enter Play Mode and observe the FPS field in the Rendering Statistics window
5. Change the layout to “2 by 3” then open the Rendering Statistics window again
6. Observe the FPS field in the Rendering Statistics window again

Expected result: Moderate performance difference - FPS is reduced by about 5-10%
Actual result: Severe performance degradation occurs - FPS is reduced by about 40-60%

Reproduced with: 2021.3.28f1, 2022.3.5f1, 2023.1.4f1, 2023.2.0a23

Reproduced on: Windows 11, macOS 12 (Intel)

Notes:
1. Reproduced with “Direct3D11”, “Direct3D12”, “Vulkan”, and “Metal” Graphics APIs with “3D (URP)”, “3D (HD RP)”, and “3D Core” templates
2. In 2022.3.5f1, 2023.1.4f1, 2023.2.0a23 using the “Direct3D12” Graphics API and the “3D (URP)” template causes extreme performance degradation → when Game view and Scene view are opened FPS drops from 500-700 to 50
3. Not reproduced with “OpenGLCore”, and “OpenGLES3” Graphics APIs and the “3D (URP)” template
4. Could not test “OpenGLCore”, and “OpenGLES3” Graphics APIs with the “3D (HD RP)” template → these Graphic APIs are not supported by the HD RP package
5. Could not reproduce in 2023.2.0a23 using the “3D (HD RP)” template with the “Vulkan” Graphics API → with either Game view or Scene view opened the performance is similar
6. Reproducible in new projects when using “3D (URP)” or “3D (HD RP)” or “3D Core” templates