On a system with an Avid Mojo DNA, you can play back most effects in real time to preview how they will look when rendered. But, depending on the complexity of your sequence, you might need to render some effects before you can output a finished sequence. You can use the ExpertRender feature to determine which effects need to be rendered. For more information on real-time preview of effects, see Real-Time Preview of Video Effects. For more information on the ExpertRender feature, see ExpertRender.

When the Avid editing application renders an effect, it stores the effect and its media file as a precomputed master clip (often referred to as a precompute). The application uses the precompute the next time to play the effect at its normal speed.

You can render a single effect after you have created it, or you can choose to render a group of effects at the same time. You can also interrupt a render in progress and choose to save or discard the completed portion. You can finish the render later by resubmitting the effect for rendering.

The key to rendering quickly is to render only those effects that require it. With vertical and nested effects, for example, you do not have to render every layer to play the effect in real time. If the top track covers the entire duration of the tracks below, the Avid editing application renders the composite result of all tracks into the top track.

One useful way to minimize rendering time is to use the Submaster effect by applying it to a track above layered effects and rendering only the Submaster effect. For more information, see Submaster Editing.