Reproduction steps:
1. Open the attached “My project” project
2. In the Build Profiles (File > Build Profiles), make sure the WebGL platform is selected
3. Build the Player and host it on a local server
4. Connect to the WebGL player with a iOS device via local IP address using Chrome or Firefox browser
5. In the Player on the device, press the “Play” Button
6. Observe the displayed video

Expected result: The playback is smooth
Actual result: The playback is jittery and lagging

Reproducible with: 2022.3.60f1, 6000.0.45f1, 6000.1.0b13, 6000.2.0a8
Couldn't test with: 2022.1.0a1 (WebGL on mobile is not supported)

Testing environment: macOS Sequoia 15.3.2 (M1 Max)

Reproducible with these devices:
VLNQA00624, iPhone 16 Pro, iOS: 18.3.1, CPU: Apple A18 Pro
VLNQA00394, iPhone 13 mini, iOS: 18.1, CPU: Apple A15 Bionic
VLNQA00359, iPhone 12 Pro, iOS: 17.6.1, CPU: Apple A14 Bionic
iPad Pro 10.5-inch, iPadOS 17.7.5 (by user)
iPhone 12 Pro max, iOS 18.3.2 (by user)

Note reproducible on these devices:
VLNQA00363, Samsung Galaxy Z Fold 2, OS: 12, CPU: Snapdragon 865 SM8250, GPU: Adreno 650

Notes:
- Not reproducible on Safari
- Not reproducible on macOS (tested Sequoia 15.3.2 M1 Max on Chrome and Firefox)