It's an issue when you've built something from many props with many constraints and the only way to show it functionally held together is to lengthen the speed of the clip to give it more time to calculate but then you'd have to shrink it back to the original size later.

I've also found that Render Resolutions directly correspond to physics calculations. 4k output prevented my chain links from holding together but the iPhone Portrait resolution allowed the chains to remain intact. 

***Update: I was able to get close to 30 FPS when not using screen video capture*** 


I've posted this on the feedback tracker https://www.reallusion.com/FeedBackTracker/Issue/Adjustable-Physics-Calculation-Time-for-Sophisticated-Scenes

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