Mac v 23.5.0 Hi all. I have an M1 Ultra Mac studio and I'm editing h265 footage from sony a7siii. Please do not suggest other codec's or proxies. This is a very specific question. I have a timeline made up of hundreds of videos, audio files and timelines and although not 100% buttery smooth, playback and timeline navigation speed is pretty good for 4k source material. The best I've ever had with any machine I've owned. However... At the end of the project, I need to make a cut down trailer of the main feature so I always duplicate the feature timeline, delete a few audio tracks I do not like and then create a shorter version of that timeline. From this point on, the performance is broken. When I say broken, I mean broken. I am currently pressing play and having to wait 5-10 seconds before playback starts. I have tried toggling all fx's off (I have a lumetri colour effect with a custom lut applied, plus some audio effects on the sound). I have tried toggling the eye on ALL video tracks. I have tried muting all audio tracks. I have restarted countless times and now I've run out of ideas. Something is very wrong and it all starts when I duplicate a timeline. Does anyone have any suggestions at all? This has been like this across multiple versions for years now.
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