In all Lightroom versions switching previews fullscreen is way to slow

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  • Updated 1 year ago
In all Lightroom versions, including the latest, in Library/Full screen mode previews switching (even lower resolution 1:1 from Smart Previews) is way to slow, so it's impossible to use the full screen mode to sort (pick/rate/reject) large amount of photos. Taking in mind that previews are simple JPEGs there is no visible reason why it's so damn slow. Tested it on range of computers, including 6-core Extreme Edition packed with PCIe SSD and 32Gb RAM with Windows 10 and top MacPro with latest MacOS X.
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Stanislav Vasiliev

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  • frustrated

Posted 2 years ago

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Simon Chen, Principal Computer Scientist

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Have you tried Lightroom CC 2015.4/6.4 which was released this week? There is some optimization to do more aggressive pre-rendering of 1:1 preview for your "next" photo when Lr finds that you zoom-in to 1:1 or going to full screen a lot when you walk the photos.

If you really do a lot of 1:1 zoom-in, you should consider building out the 1:1 previews first.
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Stanislav Vasiliev

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Yes, I updated to 2015.4 just after it was released :-) The problem is not with zooming speed, because I always render 1:1 previews during import, but with the "switch to next photo" lag.

When the 1:1 previews rendering process is finished I start to sort photos (give them pick/reject flags and stars, using keyboard arrow keys and P/X/1-5 buttons). When I do sorting in Loupe mode the time it takes Lightroom to switch to the next photo isn't big (could be better too, I assume, taking in mind all previews are rendered), but anyway in Loupe mode I even can pretty fast move forward and backward. But I cant move fast to next photo in fullscreen mode.

Let me explain this case with an example. Imagine you have to sort using pick/reject flags around 5.000 photos from a reportage. You do it like ">>>>P>>>>P>>P>>>>>>>>P>P>>>>P" where ">" is right arrow key and "P" sets the "pick" rating. In Loupe mode you run through the photos and can complete it in 1.5 hours, and I fullscreen mode it's so slow that doing sorting will take half a day.

So I mean this photo-to-photo time is way to slow.

Recorded a video what I do mean ;-) Every "click" there is a button press:

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Simon Chen, Principal Computer Scientist

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Thanks. Will look into it.
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Stanislav Vasiliev

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Thanks Simon :) Just let me know if I can help somehow
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Sreenivas

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Hi,

Is the navigation slow as soon as you launch Lightroom or it keeps getting slower over a period of time ?

ThanksĀ 
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Stanislav Vasiliev

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It's slow from beginning - tried it on an old (optimized) catalog with 100-300K imported photos, on a new/clean catalog after importing few thousands of RAW, on 4K, 2560x1400 and 1920x1080 displays in different configurations and different GPUs. I tested it right after app launch too. Full screen browsing in LR was always slow and I always had to use alternative software to sort RAW fullscreen :(

For me it looks like a bug in preview prefetching algorithm because there is no high CPU, GPU, SSD or RAM load at all during fullscreen previews browsing, but switch lag is enormously big.
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Carlos Oliveras

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This is just another of the many problems that make culling with LR an annoying and extremely cumbersome task. I do these tasks with separate programs because of LR lagginess and slow performance.