One sequence lagging...

[Adobe_Dude]

We have one sequence that lags. It currently runs about 15 minutes, multiple tracks, proxies, low res playback, all settings optimized, 3rd party effects rendered.  We get the spinning ball for a second or two then playback.  Sometimes cursor won't let go of posion bar until a couple of clicks. All other sequences with same footage and simar effects play fine.  Multicam has given us some trouble in the past.

We are using multiple projects in a production. We reimported the project into a new project and have copied the sequence into a fresh timeline. We have deleted all render files and re-rendered.

Mac Studio M1 Ultra, OS 14.5, 128GB RAM, plenty of internal and external SSD storage, Premiere 24.5.

Any wisdom?

[Peru Bob]

Try removing one clip or effect at a time to see if a particular clip or effect is causing the issue.

[Adobe_Dude]

Thanks.  Yes, that would work.  Should have mentioned that I was hoping there was an alternative.  Lots of clips, layers, and effects. That could take us longer than all the lagging!  🥴

[PaulMurphy]

What kind of media are you using in your timeline? Any BRAW or DJI h.265?