In the background, the conversion of the raw file to produce the full-size RBG preview is done, and when complete it replaces the CR cache entry (a process which is practically seamless from a user prespective).

Thus when we select a raw file for editing in Develop, that CR cache entry can be loaded almost instantly, which allows us to start editing. So rather than have the user twiddling their thumbs waiting for the full-size RGB preview to appear, a much smaller RGB preview is created (during import or when previews are built) and stored in the Camera Raw cache. That conversion process happens every time we open a Raw file into the develop module, and it can take several seconds or longer before a 'scene-referred' RGB preview is available in the system cache and can thus be displayed ready for editing in the Develop display window. in its raw state it is NOT an RGB image and has first to be 'converted' to RGB data that can then be displayed in image form.

A Raw file consists only of sensor data, i.e. There really shouldn't be a need for an additional cache for Jpeg files.

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