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Lightroom 4 Export is Extremely Slow

Lightroom 4 (4.0) is extremely slow when exporting web galleries. it takes approximately 15 seconds per image (meaning if you have 100 images in your gallery it takes nearly half an hour to export!!!). i am working on a mac pro running lion 10.7.3 with 14GB ram... please help!
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  • TinaC (Tier 3 support engineer) May 09, 2012 16:52
    Can you please install the Lightroom 4.1 Release Candidate 2 on labs.adobe.com and let me know if this helps?
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  • TinaC
    If Lightroom 4.1 helps at all, the speed increase in negligible. Are you under the impression it is an improvement?
    I am utterly flabbergasted. This appears to be a feature Adobe incorporates into Lightroom to frustrate as it's obvious there is no interest in making it work efficiently. Amazing.
    I will now export jpegs and then import into LR3 for making web galleries. LR4 is like using a 10 year old computer for web galleries.
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  • Wondering now if this problem is the Web module in LR4, or just that LR4 is painfully slow at exporting ALL files. Doing a test to compare web gallery in LR3 and just exporting 800pxW quality-80 jpegs in LR4 is really s-l-o-w.
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  • hey stephen,

    i actually had success (a 10 fold increase in speed form about 20 seconds an image to about 2 seconds an image) when i updated to rc2. i hope that information can somehow help resolve your issues, although i am not sure how? when i was having this problem, it only affected the web module as far as i can recall and basic exporting worked as expected. good luck! i know how frustrating this can be!!!

    and while i think you meant it sort of tongue on cheek, i certainly don't think that adobe is causing this problem intentionally or doesn't care to fix it. i think it is a bug that they are trying their best to resolve.

    i will add that adobe has done some other things that are within their control that i find quite frustrating (like releasing lightroom 4 with the 2012 process enabled but not doing so in photoshop so that you could not work fluidly across both platforms... i believe cs6 is out now and it is no longer an issue, but it would have been nice if the upgrades had been released together!).

    i would also like to add that tina was very responsive, friendly, professional, patient and helpful in all my interactions with her. much appreciated... thanks tina!
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  • - Initially I did not understand the Lightroom 4.1/RC2 distinction. However, after updating to RC2 JPEG export is slightly SLOWER.
    - I believe I understand what is happening - the SMALLER the JPEG that is exported the LONGER it takes. I did the following test exports from the same .CR2 file (all done in LR4/RC2):
    CR2 > Original 1.2 seconds
    CR2 > JPEG-Quality 80/2000px Long Edge 16 seconds
    CR2 > JPEG-Quality 80/800px Long Edge 23 seconds
    CR2 > JPEG-Quality 80/200px Long Edge 51 seconds!
    So if you make a Lightroom Flash Gallery the includes both Large and Thumbnail images it will take an eternity because it requires 2 sets of very small JPEGS.
    I'm guessing Adobe has sacrificed speed for quality in LR4, but this is a huge conundrum that makes the Web feature almost useless for a large number of images. [I will try using iView Media Pro until this gets revolved.]
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  • hey stephen... i tried running some similar tests:

    regular export:
    dng > dng : 2" each
    dng > tif, 8bit, lzw: 3"
    dng > jpeg 80q/200px : 7"

    web gallery export:
    flash gallery, dng > xl thumbs and xl "large" images: 3" each
    flash gallery, dng > sm thumbs and sm "large" images: 4" each

    the pattern is the same as yours in that when it has to resample or perform additional transform (e.g. lzw) it takes longer than a same size or same format export, as you would expect, but i don't have the ridiculously excessively long processing times that i had before the rc2 release... hmmm?

    i'd be curious to know what happens if you try starting with a dng instead of a cr2? i tired running the small jpeg export test starting with cr2 and the results were almost identical (about 8" with cr2 vs 7" with dng).

    what process version are you using (i am using 2012)?

    does it make any difference if you process just 2 or 3 images vs a much larger set?

    hope you are able t get it figured out...
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  • This reply was removed on 2012-06-08.
    see the change log