Moving clips is very slow

Help/How To
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Shotcut Version 22.06.23
OS Windows 11
CPU E5-2697 v3 @ 2.60GHz
RAM 48.0 GB
NVIDIA GeForce GTX 745
SSD boot OS drive
HHD for storage
I use a server normally to store my source video files but I drug the majority to my local computer to isolate that bottleneck.

What I experience is either when I click undo after deleting the wrong clip, or dragging it into an adjacent clip or even if I move a clip to a different row the mouse turns into the spinning wheel and shotcut will sometimes even crash. It seems like there is a hardware bottleneck somewhere, but when I look at my performance stats I don’t see anything maxed out.

I am using proxy and preview set to 540p.

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This may be related to the problem explained here:

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I think it might be, this started as a 9 hour long project and is now just under 2 hours. Thanks for the direction.

UPDATE: a quick test does seem to confirm this. Copy/cut/paste does not seem to cause the crash. Also I did confirm that if I “undo” a mistake where the move kept the clip in its respective track, it doesn’t cause the crashing.

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