How to reproduce:
1. Open the “UIToolkitPerformance.zip“ project
2. Open the “TestScene“
3. Build and Run for Android (Development Build)
4. Connect the Profiler to the Device

Expected result: No large increase in the time consumption for the rendering process
Actual result: A large increase in the time consumption for the rendering process when adding background color and/or texture

Reproducible with: 2021.3.47f1, 2022.3.55f1, 6000.0.32f1, 6000.1.0a9

Reproducible environment: macOS 15.1.1 (Intel), Windows 11 (Reporters)
Not reproducible environment: No other environment tested

Reproducible with these devices:
VLNQA00178, Xiaomi Redmi Note 4 (Redmi Note 4), Android 6.0, CPU: MediaTek Helio X20 MT6797M, GPU: Mali-T880
VLNQA00107, Huawei Nexus 6P (Nexus 6P), Android 8.1.0, CPU: Snapdragon 810 MSM8994, GPU: Adreno (TM) 430

Not reproducible with these devices:
VLNQA00511, Samsung Galaxy S8 (SM-G950F), Android 9, CPU: Exynos 9 Octa 8895, GPU: Mali-G71
VLNQA00335, Samsung Galaxy S20+ 5G (SM-G986B), Android 10, CPU: Exynos 990, GPU: Mali-G77
VLNQA00518, Google Pixel 4 (Pixel 4), Android 13, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00152, Huawei P9 (EVA-L19), Android 7.0, CPU: HiSilicon Kirin 955, GPU: Mali-T880
VLNQA00535, iPhone XS (MT9F2ET/A), CPU: Apple A12 Bionic, GPU: Apple designed, OS: 17.6.1
VLNQA00600,  iPad Pro (9.7 inch, WiFi), CPU: Apple A9X, GPU: Apple designed, OS: 14.8

Notes:
- Not reproducible in the Editor or Standalone
- Reproducible with both OpenGLES3 and Vulkan Graphic API
- The reporter pointed out that the issue is coming from the “UnityUIE.cginc“ file, where the extensive branching (particularly when selecting texture) creates performance issues on some older Android devices
- More information in the comments