When editing with demanding footage (e.g., timelapse b-roll), playback constantly buffers - waiting minutes to play just a few seconds. Final Cut Pro lets you manually drop playback quality (e.g., below 10%) to scrub and edit smoothly, then it's rendered at full quality on export. Descript's auto-generated proxies aren't low enough for this use case. Please add a manual playback/preview quality setting so the tool works with heavy footage instead of forcing users to split projects or close other apps.