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Why is the After Effects 4.x RAM Preview not realtime?

April 26, 2017realtime

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Why is the After Effects 4.x RAM Preview not realtime?

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Each frame is being compressed in software, which limits the throughput. Even though After Effects has rendered each frame and has it in RAM, the frames are uncompressed and still need board-specific compression before they can go out to the video monitor. In After Effects 5.0, using RAM Preview automatically disables Echo Fire so that RAM Preview can operate at full speed. For realtime video previews in After Effects, use Echo Fire’s Rapid Preview feature. Instead of using RAM Preview, press shift + space. Echo Fire will begin rendering any frames it needs. When the area you want to see has rendered, press space to begin the looping preview. When done, press space again to stop the preview. There are other Rapid Preview options; please see the manual for details.