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[Andy Finch <684889@xxxxxxxxxxxxxxxxxx>]

Can you provide some details of the type of video files you are using?
For what it's worth, I don't have these problems running a 3 or 4 track
project.

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https://bugs.launchpad.net/bugs/684889

Title:
  Performance issues with multiple tracks

Status in OpenShot Video Editor:
  New

Bug description:
  OpenShot 1.2.2 (and 1.3.0~alpha1), Ubuntu 10.10

When I create a multi-track OpenShot project, and try to preview the video, if I have any more than one video running at the same time (different videos on multiple tracks), the preview slows to a crawl. It gets worse and worse with every video/track I add.

Adding titles, effects, music on top of video (some of which cross over each other) slows OpenShot down so slow when previewing that it becomes impossible to edit/review.

The preview, including jogging, needs to run at real time, else I can't see how certain effects, transitions, sound edits, etc. work and makes OpenShot therefore unusable.