When playing a file in Nuke Studio or Hiero, it will start caching on import to help ensure you can start playing the footage as soon as possible. However a moreplex track, playing back two 4K tracks, compared to one, would required twice the drive speed, as it is reading double the data. As such a simple edit, with a single track and no soft effects will require less disk read speed and processing power than a timeline with multiple tracks, clip versions, edits and soft effects. Nuke Studio and Hiero operate by playing the top level clips on the given tracks in a timeline and then processing any soft effects that have been applied on top. As such your read speeds will need to increase accordingly. Similarly to file types, bit rate and resolution, the higher the frame rate you wish to use the more data that needs to be read from disk. For some information regarding testing we have done in-house with 1 6-bit RGBA DPX sequences, and the drive speed required for that example, please see our documentation here: Achieving Real-time Playback
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