Why is my video sounds slower than the video playing

Why when I record a video the sound starts way after the video has been started

Macs normally slow down a bit over time. Uninstall any unneccary apps and try keep the ammount of hard drive space free more than 50%. To find out how much hard drive space you have left click the apple logo in the menu bar and click "About This Mac" Then click on "More Info" and after that click on "Storage".
Also, try to see if there is anything wrong with your hard drive. To do so click on the liitle rocet icon (launchpad) in the dock and click on "Utilities". Then click on the "Disk Utility" app. Then select "Macintosh HD" in the left menu/ Then click "Repair Disk Permissions". Wait for it to finish. Then click "Verify Disk". Wait for it to finish.
After that, if Disk Utility says you have any hard drive errors, click "Repair Disk".
Lastly, try a good old restart!. This always speeds up a Mac.

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