Hi,
I’m experiencing the similar issues in our project. Here are log entries and you can see that AddClone requires sometimes several seconds:
06 Nov 2025 18:24:23.072 Masters.AddClone(sourceMasterSlide) // <- ~1sec
06…...Performance When Cloning Master Slides from One Presentation to Another...C# Aspose.Slides Product Family slides-net , slides-performance...