No lag. No crashing right before a render. Just a smooth timeline that lets you get the story done fast. 🚀
To run version 10.3.3 effectively, your hardware needs to meet specific criteria. Using older hardware may lead to "spinning beach balls" or slow export speeds. : macOS 11.5.1 or later. Imovie 10.3.3
Fix: Go to ~/Movies/ and rename your iMovie Libraries folder to iMovie Libraries_Old . Restart iMovie. It will create a fresh library. Then, import your events from the old folder. No lag
: Specifically enhanced the reliability of using drag-and-drop to replace transitions within the timeline. Stability and Performance Imovie 10.3.3