Tangier Clarke brought this issue to my attention.
If you have a complex Apple Final Cut Pro timeline, especially if it was imported using XML, it may slow almost to unresponsiveness.
Tangier used XML and SendToX from Intelligent Assistance to transfer a Premiere Pro project into Final Cut Pro. SendToX adds red to-do markers to items to draw your attention to what has changed or been substituted on the FCP timeline.
Once that XML file was imported, Final Cut performance drastically slowed down. Tangier detailed the issues this way:
Here’s the thread on FCP.co that explains this in more detail.
Link: Too Many To-Do Markers Cause Timeline Slowdowns
Tangier also emphasized:
“Gregory Clarke at Intelligent Assistance is always helpful to me and very responsive; so much so that he’s updated apps after I’ve discovered an issue or requested a feature that would significantly help the FCP community.
Although SendToX is incredibly thorough in bringing as much information over as it can and translating one NLE’s timeline for another, I hope people don’t read this and think SendToX is the problem. Its results can give FCP a lot to chew on, but from user Joema’s findings, those results shouldn’t impede FCPs heralded responsiveness. There’s something else going on still to be discovered. Joema is reporting all of this to Apple.”
I contacted Greg Clarke, at Intelligent Assistance, about this. He, too, thinks this is more than a marker problem. He wrote:
I have some insight into markers I’ll share with you, but I don’t think it explains this situation.
SUMMARY
Adding a few dozen To-Do markers to any Final Cut project won’t cause any problems. However, if you regularly import transcripts into FCP, or use XML to transfer projects, take the time to read this thread, especially if your system seems to be slower than usual.
We don’t yet have a solution, but we do have a better understanding of the problem. I’ve also sent a note to Intelligent Assistance to see if we can learn more.
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