Optimize animation performance for experimental shimmer

[chiuam]

Platform

• iOS
• macOS
• win32
• windows
• android

Describe the feature that you would like added

Investigate whether the current animation implementation causes performance issues, optimize if needed.

What component or utility would this be added to

Experimental shimmer

Have you discussed this feature with our team, and if so, who

@PPatBoyd

Additional context/screenshots