shotcut
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Shortcut is dead with long file
Shotcut 19.10.20
Shortcut becomes unresponsive after second move in timeline with only one long file. It consumes all CPU and there is a memory leak.

Are you running two instances of Shotcut?
Yes. In one there is main project. Other used for creation of small sub-scenes to simplify main project.
Yeah there is some weird performance issue with multiple instances and not just on Windows. I have seen it on macOS too.