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Reply To: [Solved] Final Cut Pro ProRes 422 HQ Export Hanging at 68% on Mac Studio M1 Max: How to resolve External APFS NVMe disk write throttle and corrupted optical flow motion vector cache
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Stephanie MendezPurging generated project render files and disabling Optical Flow on speed-ramped clips.
Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:
- In Final Cut Pro, select your Project in the browser, go to File > Delete Generated Project Files, and select Delete Render Files (All).
- Select any re-timed/speed-ramped clips, open the Video Inspector, and change Video Quality from Optical Flow to Frame Blending.
- Export destination should be an internal APFS location first before transferring to external storage.
Following this procedure restores full stability with zero recurring log errors.