Is Camera Raw Cache needed when you have Previews?

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My Camera Raw Cache is taking up 30GB on my SSD in both Local and Roaming folders, so its eating up 60GB of my C-drive. If Previews are created with my Lightroom Catalog, why does the Cache even need to exist? I made it larger to improve Lightroom performance as ready online, but now it is reducing the space on my drive too low.
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Katherine Jassmann

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Posted 5 years ago

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Rob Cole

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Preview "cache" is for library previews (jpegs used primarily in library module).
Camera Raw Cache is for info which assists in Lightroom's develop module, and is shared with the ACR used by Photoshop and Bridge.

So to answer your question specifically: Yes - you need both.

That said, consider purging your camera raw cache. Lr4+ requires less info than Lr3- in that cache, so you may have some junk..
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Victoria Bampton - Lightroom Queen, Champion

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You can reduce the available space right down - 5 GB is plenty for most people - as the size of the cached files are much smaller than they used to be.
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Rob Cole

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Worth noting: ACR cache setting determines max size - if space not fully used, it's not being reserved.

Thus if you have your cache set to 100GB it still won't take away any more than 5GB from your system, if that's all that's being used.

Bottom line:
* definitely purge your cache.
* reducing max allotment is optional. If Lr5, it probably won't make a difference, since it'll never reach the max anyway. If Lr3, then you may want to reduce it, if you are constrained hard-disk space-wise.