Lightroom: Severe lag / slow downs with mid 2015 imac 5k

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  • Updated 1 year ago
  • (Edited)

LR is extremely frustrating to use right now. Lag becomes unbearable.  I see other posts with similar issues but still not fixed??


imac mid 2015 3.3ghz i5 32gb ram

radeon r9 m290 2048mb  (gpu turned off)

no 3-rd party anything loaded

osx 10.11.6

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Aaron Feinberg

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  • frustrated

Posted 1 year ago

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Carlos Cardona

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Upgrade to Sierra! It's helped other people.
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Aaron Feinberg

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I was just talking with a friend of mine thinking that it could be a thing.  I'm SO skeptical of ios/osx upgrades these days.  Hence I've been putting it off. 
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Carlos Cardona

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As an IT Pro, I always wait until .2 or .3 to upgrade my main machine. We are at 10.12.3 now, and my lightroom works great
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Peter Vogel

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If your LR is slow now on that machine with those specs, I doubt very much, that going to Sierra will change that.

My spotting brush hangs 3-5 seconds one day, the next day it will work almost real time. I have always the same programs running, so the environment doesn't change. LR has some other issues, that sometimes appear, other times things will work as designed.

As long as I don't have any issues with the quality of my file processing, I just take it day by day and deal with it.

Photoshop always works fine, all tools are in real time speed and there are never any hangs! So, for a program like PS, that still carries around ancient code, you would rather expect it to show the behaviour of LR.

When LR was introduced, they emphasized, that it was written freshly from the ground up to not have the burden of old coding. So you would expect it to be the snappier tool to work with, but it is not.

Yes, there are tons of posts here, where users are complaining about speed and laggy tools. I never heard a statement from Adobe regarding these matters, if they are aware of that, if they are trying to fix it, if they know why it is like that, but are not able to fix it???

Good customer support and transparent problem solving is certainly not on their list of priorities! Number one priority seems to be to force all customers into one of their subscription plans.
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Aaron Feinberg

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Upgraded to Sierra.  No change.  Still painfully laggy.  Kinda blown away at this ridiculous performance :/
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Peter Vogel

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Aaron, can you describe in more detail, what features are really slow for you? Or is the whole program painfully slow?

Do you have face recognition running? I tested that for 3 days when it first came out and decided, that it was the crappiest peace of software implementation I have ever used coming from Adobe and turned it off since then. It brought my machine to a crawl while running on 20.000 images and it did a really bad job recognizing faces!
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Art M.

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I have never turned on face recognition.   Is it turned on by default?   That would explain a lot!
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Rikk Flohr, Official Rep

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Example operations and the time in seconds it takes for them to complete would be a big help in drilling down on the cause(s) of the slowness you are seeing. 
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Aaron Feinberg

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I'll post video if that will help.  Basically it's just about everything.  Before/after.  Sliders. Cropping.  Takes about double+ the time just to load the preview in loupe vs the laptop. 
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Rikk Flohr, Official Rep

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I am not sure what I am looking at Aaron. The cursor doesn't perform any operation - just spins. What is is happening in this video?
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Aaron Feinberg

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@rikk - before/after operation using the \ .   sorry for not being descriptive.
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Rikk Flohr, Official Rep

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5k Monitor - only a 2 GB Vram? seems light. If you turn the GPU on is the speed the same?
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Aaron Feinberg

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I assume you mean the raedon card?  i can test later.  afk until this eve (HST).   i have experimented w gpu on and off with no change in the past though.
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Aaron Feinberg

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Just had a chance to test and no improvement in performance with GPU on.  
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Rikk Flohr, Official Rep

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Thanks for checking that Aaron.  I will consult with the team.
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Aaron Feinberg

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If you want to contact me  I would be open to working with you directly on this. 

As I sat down this morn LR did crash while in the background idling as well.

I did notice a slight improvement as well with the gpu on.  Though still laggy compared to the much lower spec mbp.
(Edited)
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Rikk Flohr, Official Rep

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Aaron, 

CC 2015.10 was released today. Can you update and let me know if you are still seeing the issues? Bettter? Worse? The same?
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Aaron Feinberg

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the issue is with LR not PS....

edit- the LR update hadnt pushed through yet.  will update tomorrow pm and report back!  thanks!
(Edited)
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Aaron Feinberg

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Ok...just back home.  Updated.  From what I see the adjustments are less laggy but see video.  Opened up a random image with a random brush and just wanted to paint around.  You can see the result.  Moving the sliders is pretty smooth but this brush action is crazy. 
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Rikk Flohr, Official Rep

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Thanks for the video.  Responsive sliders and lagging (adjustment brush or spot removal) are indicative of active GPU. Do you have  your GPU box checked in Preferences>Performance? 

GPU is very good at refreshing screens with slider movement and not as good at keeping up with brushing. If you turn GPU off, I am guessing that your Slider/Screen will degrade slightly but brushes/spot removal will improve. Is this correct?
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Aaron Feinberg

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Correct.  Slider performance degrades but brushing is a bit smoother.  Still not sure why I have 0 problems on my 2012 machine and the 2015 is quite frustrating to use.
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Rikk Flohr, Official Rep

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What is the processor on both machines?
What is the Video Card model on both machines?
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Aaron Feinberg

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MBP mid 2012;
2.7ghz i7
Intel HD Graphics 4000 1536mb

iMac mid 2015;
3.3ghz i5
AMD Radeon R9 M290 2048mb


The ONLY thing I can think of is that even with the newer and 'higher' specs the i5/i7 difference is making the entire problem.  Even still I would expect LR to be able to perform fluidly on a computer with those specs.
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Geoff Decker

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There have actually been a few studies done on this with newer and higher core processors lightroom actually runs worse. Its not made for new tech.
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Aaron Feinberg

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I mean...in my side by side comparison I would say with 100% certainty that is the case.  Crazy.
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Craig Volpe

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I had a similar problem with my late 2014 27" Retina 5K iMac. It wasn't until over a year later that I finally figured out that most of the slowdown was caused by the 5K display being such high resolution. Is your iMac also 5K?

There are two solutions I discovered, neither of which is ideal, but much better than dealing with the horrendous lag.

1. Go to System Preferences > Displays, and make sure the resolution isn't higher than 2560 x 1440. To do this hold Option and click on Scaled under the Resolution setting. It should show a list of different resolution options. The reason I chose 2560 x 1440 is because that resolution is 1/4 the native 5K resolution so the computer doesn't have to do any aliasing when mapping pixels to the new resolution. You could also try going to an even lower resolution like 1280 x 720, but that's way too low for my tastes.

2. The next thing you want to do is open Finder and locate the Lightroom app. Right click on it and Get Info. Select "Open in Low Resolution".

Doing these together will keep the computer at a fairly high resolution of 2560 x 1440 (traditionally the standard for 30" monitors) but run Lightroom in a lower res mode since rendering previews at 2560 x 1440 is still pretty processor intensive. For what it's worth, I have the GPU option turned on in Lightroom, but I don't think it makes that big a difference. Hopefully this works as well for you as it did for me!
(Edited)
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Aaron Feinberg

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Thanks for that.  Yes, this is 5k, but the default resolution is what you recommended.  So left that alone.  Did 'open in low res' and that has seemed to help actually.  So I did some more tests...

<<Got LR to run smoothly>>

Changed monitor resolution to 2048 x 1152 (one stop down from default; 2560 x 1440).  LR was already loaded in "low res" mode per above.  GPU off via performance settings.

----

Not only did this fix the brush issue my loupe mode previews were instananeous (max wait was about 2-3s vs 10+s for a simple loupe view before). 

So...just have to keep LR in low res mode & change screen resolution each time I want to edit...simple eh? 

Adobe...???
(Edited)
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Aaron Feinberg

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Update....still MASSIVE lag issues.  GPU off.  Updated osx and LR to latest.  Getting super discouraged :/

ps. most apparent/difficult with the wb sliders. 
(Edited)