• Welcome to the Lightroom Queen Forums! We're a friendly bunch, so please feel free to register and join in the conversation. If you're not familiar with forums, you'll find step by step instructions on how to post your first thread under Help at the bottom of the page. You're also welcome to download our free Lightroom Quick Start eBooks and explore our other FAQ resources.
  • Stop struggling with Lightroom! There's no need to spend hours hunting for the answers to your Lightroom 6 questions. All the information you need is in Adobe Lightroom 6 - The Missing FAQ!

    To help you get started, there's a series of easy tutorials to guide you through a simple workflow. As you grow in confidence, the book switches to a conversational FAQ format, so you can quickly find answers to advanced questions. When you upgrade to subscription, there's also a Lightroom Classic version available.

Previews.lrdata folder size as it relates to performance?

Joined
Oct 23, 2007
Messages
680
Location
Perth, Australia
Would like to see what size (Mb/Gb) everyones previews.lrdata folder is and how many images in the catalog?

For some reason my previews folder is 2.8gigs, yet only 20,000 images! Is this normal?

I am getting serious poor performance issues with 3.4 and preview generation and writting of data into dng's is killing me.
 

b_gossweiler

Senior Member
Joined
Jun 19, 2009
Messages
3,207
Location
Zurich, Switzerland
Lightroom Experience
Advanced
100GB, 20'000 images, lots of 1:1 previews

Beat
 
Joined
Jun 20, 2009
Messages
18,397
Location
Houston, TX USA
Lightroom Experience
Power User
Lightroom Version
Cloud Service
I do not think Previews.lrdata folder size has much bearing on performance. My justification for this is that most of the time you are importing and working on new images. These do not exist in Previews.lrdata or in ACR Cache until you begin working with them. There will always be a performance hit generating these into cache and preview location initially. Your cache and Previews.lrdata folder capacity only needs to be large enough to hold a current import card(s) worth of data. It would be better if to were empty available space rather than caching operations to drop older files to add new ones. You only need to keep these in cache while they are active. If you rework an old file, then the cache get regenerated only when you do.

FWIW, my Previews.lrdata folder is 10GB and my ACR Cache is limited in preferences to 35GB I keep my 1:1 previews for 1 week and my preview size is 1680 pixels
 

pgman

Member
Joined
Apr 1, 2011
Messages
74
Would like to see what size (Mb/Gb) everyones previews.lrdata folder is and how many images in the catalog?

For some reason my previews folder is 2.8gigs, yet only 20,000 images! Is this normal?

I am getting serious poor performance issues with 3.4 and preview generation and writting of data into dng's is killing me.

1. 2.8 Gb from previews is no problem. Must be just the last 30 days setting. Sound like more a hd or i/o problems.
2. What kind of hard drive and how much free disk space do you have?
3. How are you using the SSD? What is it for? Catalog...
4. What else is running at the same time? Antivirus?
5. Have you done a disk cleanup to delete the temporary files?
6. Have you done 4 or 5 disk defrag after removing the temps?

Don't forget that previews are not necessary. LR will generate them on the fly instead of reading them from the disk.
 

AndreGurgel17

New Member
Joined
Sep 27, 2011
Messages
2
Lightroom Experience
Advanced
Previews in another drive

The catalog (lrcat) is essential; the previews (lrdata)are NOT.

The former should be included in the backup plan; the latter, optional.

So why both set of files must be placed under the same LR folder?

Can I place the lrdata in a temp folder or drive, probably the same one where the ACR cache resides?

Could you, PLEASE, include an option to do that in the Catalog Configuration dialog?

Thanks.
 
Joined
Jun 20, 2009
Messages
18,397
Location
Houston, TX USA
Lightroom Experience
Power User
Lightroom Version
Cloud Service
AndreGurgel17, Welcome to the forum.

Previews.lrdata folder is essential. It is one of the things that keeps LR running efficiently. Sure you can delete it , but LR will just rebuild it. And rebuilding it each time is inefficient causing performance to take a hit until the cahce folder is back to optimum size. The folder needs to be located in the path where the LR catalog is located. (i.e. adjacent to the catalog. This permits LR to find it or know that it can write to it in a path location that the OS has permitted LR write privileges. I suppose you could tell LR to write the previews somewhere else and you are welcome to submit this as a feature request in the link at the top of this page.
Previews Cache are different from TEMP folders and LR uses these too. If you want to physically locate the cache file in a different location from the catalog, create a symbolic link using the OS to reference the actual location.
 

b_gossweiler

Senior Member
Joined
Jun 19, 2009
Messages
3,207
Location
Zurich, Switzerland
Lightroom Experience
Advanced
I second Andre's request for it to be configurable in catalog settings. I myself use a symbolic link so I can have my previews on an SSD. But why should I have to bother with OS tools, which are only accessible as command line tools and also not from an explorer context menu without any add-ons or third party software installed.

Beat
 
Top