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How to troubleshoot video lagging and audio out-of-sync issues during preview?

Step 1: 
Launch Wondershare Filmora on your computer and open the video you are editing.
Step 2:
Click the “Render” button to see if it resolves the issue.
Step 3: 
Try adjusting the preview quality to a lower setting, such as 1/2 or 1/4.
Step 4: 
If the source video is 4K or HD, it is recommended to create a proxy file first and then add it to the timeline.

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