90 VIDEO EDITORInstant PlayInstant Play lets you quickly see the changes you have made in your project in thePreview Window. Simply click the Instant Play button or access it in the PreviewWindow Menu to enable or disable it.Since the complexity of a project may vary (e.g. a lot of special effects) in differentsegments, you can set the Performance Level (by right-clicking the Toggle button)to determine whether Video Editor renders a preview file or not when you arepreviewing your video clip.Video Editor renders only when a segment's complexity level is above theperformance level you set. The Performance Level you set should be relative toyour CPU speed.You may also force a particular segment to be rendered to have a smootherpreview.To force a segment to render:1. Right-click on the Complexity bar just below the Timescale.2. Select Force To Render Segment & Preview. Video Editor creates a previewfile of the particular segment even when in Instant playback mode thenautomatically previews the rendered segment.3. You can also set the preview range by selecting Set Preview Range or forcethe segment to render at the same time by selecting Set Preview Range &Render Preview.A segment refers to a vertical stack in the Timeline.
