Imovie 10.3.3: Patched

iMovie 10.3.3 crazy slow at times... - Apple Support Community

: Click the download icon. If a prompt appears asking to download a compatible version, select to get the latest version supported by your specific macOS. Apple Support Community Troubleshooting Common Issues Imovie 10.3.3

To add music or voiceovers to your video: iMovie 10

While it wasn't a "feature-heavy" update, it was a critical maintenance release that made a massive difference for everyday editors. Before this version, many users (myself included) were dealing with jerky playback and timeline scrolling issues on newer macOS versions. Imovie 10.3.3

Once you've imported your media files, it's time to create a new project: