Performance Regression: iPhone Version 18.2 Takes More Time to Render Volume Than Version 18.1

Hello,

I am experiencing a performance regression in my application when rendering volumes on iPhone. Specifically, I have noticed that iOS version 18.2 takes significantly more time for each render cycle as compared to iOS 18.1.

Details:

• Affected Versions:

  • iOS version 18.2
  • iOS version 18.1 (baseline for comparison)

• Issue Description:

  • In iOS version 18.2, the time taken to render volumes has increased compared to iOS version 18.1. This performance regression is affecting the user experience in my application.

• Test Example:

  • https://www.cornerstonejs.org/live-examples/volumeviewport3d

• Steps to Reproduce:

  • Load the above test example on an iPhone running version 18.2 using safari.
  • Perform volume rendering using the provided dataset.
  • Measure the time taken by volume for each rotate or drag action.
  • Repeat the same steps on an iPhone running version 18.1 for comparison.

Additional Information:

• Device Model Tested:

  • iPhone12, iPhone13, iPhone14

• iOS Version With Issue:

  • 18.2
  • 18.3(Beta)

I would appreciate any insights or suggestions on how to address this performance regression. If additional information is needed, please let me know.

Thank you.