When opening a .blend file in the Video Sequence Editor, occasionally there is a strip preview going on which significantly slows down Blender until it is done with the preview. Can anyone tell me what it's about and why it does that every time you open the file? Where are settings for the strip previews?
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1$\begingroup$ Maybe there are proxy files being created? $\endgroup$– SamothCommented Dec 6, 2015 at 16:27
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2$\begingroup$ Possible duplicate of VSE playback frame rate drops down with effects $\endgroup$– user1853Commented Jul 4, 2016 at 18:56
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1 Answer
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The behaviour you describe sounds like the Waveforms are being generated for some Sound strips and that is causing your slowdowns.
When you have one or multiple Sound strips you can check Draw Waveform in the Strips Sound Properties (on the right, open VSE's Properties Panel pressing the N key) per Strip.
When you want to set the behaviour for all Strips you can do so since the work on the gooseberry branch. They introduced this Feature there directly in the VSE's Menu Bar, but later implemented it in the Master Branch into the View menu with an own submenu Waveform Drawing where you can switch between two global options for turning Waveforms On or Off for all strips or let each strip determine on it's on property as described above whether or not to display its Waveform via Use Strip Option.
(You can script this if needed)
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1$\begingroup$ Related: blender.stackexchange.com/a/57839/2843 $\endgroup$– SamothCommented Jul 14, 2016 at 16:13