Lightroom 2015.6 Extremely Slow

I agree this is really driving me crazy - Lightroom keeps stopping everytime I move a slider or switch to a new image.  My work is getting further behind and I have about 30 shoots to finish - arggggggg - Come one Adobe give us back the previous version at least it didn't keep stopping.

Gwen, then do this. It takes you 10 minutes and after that you're much happier:

https://helpx.adobe.com/lightroom/kb/roll-back-to-prior-update.html

I will try that Mihael, - turn it off image by image? Wow! Umm I will try that but Adobe should really sort this. Thanks for your reply

I say OK. And yet total nonsense. To turn off features in order to kick the old bucket running!?!

That shouldn't be necessary. Adobe would much rather figure out why it's that slow for you and not for most users. The more information you can provide on system specs, monitor resolution and graphics card (& its driver version), camera type, timings, etc, the more likely they are to find the pattern.

I appreciate Victoria, if Adobe would fix this. But I do not know user that would say Lr is fast. I tried C1 - it have a lot of shortcoming too, but it is not as stammeing as Lr when loading image ir moving sliders. I use Lr from Version 1,5... never was fast. As computers goes faster, images grow in size, so relatively we are the same after decades. And I have everything on SSD's, separate for system, Lr catalog and cache (12GB), and images, than GTX770 card, 32GB 2133 ram, 6-core cpu... and I wait for sliders... not (so much) if I disable NR and sharpening and lens distortion. But still... I remember now defunct CINEFORM FIRST LIGHT software - RT as it can be - for video. Yes we like Adobe integration, but we pay it hard every day. I must say that I search elsewhere for alternative. But Adobe won this buying all relevant products in the past. 

I have 99 GB of cache now. Maybe it is slightly more fluent..

Agree on this, mine is even larger(90GB) and I've never seen an improvement. I'm also optimised out!

So is mine. (88 GB).

Nothing.

Build 1:1, running both catalog and DNG files doesn't improves local adjustment and spot removal at all. Neither is my video card which btw is almost unused the whole time. :-(

Addition: RAM-Usage was around 15 Gigs for all while it was unbelievable slow.
Now RAM-Usage overall (for the System) is something around 6 to 9 Gigs. Hmmm...

2nd Addition.
RAM-Usage goes up again to 15 Gigs and LR slows down. But not that dramatic way.
Minimizing (not closing) LR and the Usage goes down to 7 to 8 Gigs.
Maximing LR and it runs again fast.
Memory Leak?

Yes after time of usage Lr become "clogged" up and restart helps wastly. But that was with small cache. In 99 GB of cache that is not the case any moore. But unfortunatelky we are talking of it's natural slowness, not extra slowness when cache is full. 

can't be certain that I can see improvement, but thank you for the tip.

the plugins - if there were located in the modules folder
C:\Users\User\AppData\Roaming\Adobe\Lightroom\Modules
they lasted the reset other wise the didn't so I have moved them to that folder and they came back.

important point about spot removal which is an issue with the last version as well.
1. I'm aware of the GPU acceleration issue - that it works faster without it.
2. I found that the main problem of slowness by far is the 4K resolution
3. for example if I do spot removal on 4k on big panoramas of 40000x7000 pixels (280MP) it takes about 8 seconds between each spot removal click to until I get my mouse control back (this includes black screen flicking back and forth). GPU acceleration off., with GPU Acceleration on its about 13 seconds for each spot removal click, and the detail tab is switched off (noise removal).
4. now the best part is that once I switch to 1920x1080 it is instant yes !! on the same massive file.
5. my spec is Nvida GTX 980 Ti, i7 5960X 8 core 64GB DDR4 everything is on m.2 PCI EXpress NVME and SSDs 
6. my files are Phase one IQ280 - 80MP
7. The slowness is in everything but mostly in spot or local adjustments functions (with the GPU off) the when I do sliders adjustment WB / Exposure I turn the GPU back on and its relatively ok in 4K but in 1920x1080 its super fast.

I have the latest drives from nvidia.

any suggestion will be welcomed.

This corrected the issues I have been having since the most recent update. Thank you.

I presume I will need to reinstall all the plugins?

Normally, no. They should come along for the ride. 

4k display?

Look at my comments 5 hours ago.

That's what triggered the thought Stefan. I'd love to know if others are noticing the same... and if you are, is sync on and what are you doing before the memory starts to rise?  I've only seen it twice in some weeks of usage, so is it occasional or all the time for you?

OK, what i was doing before... Everything. :)
I notived that behaviour with the RAM yesterday for the first time.
What i did before:
- Imported around 200 RAWs, automatically applied a preset and keywords, 1:1-Preview-Generating and then Rating the Pictures at 100%. Nothing else. Saw the RAM-Usage of 16 Gig (i have 32 of them)
- After restart RAM-Usage was ok. Then rated the Pictures and nothing else. RAM-Usage goes up.
- Another restart and just adjusting the exposure and uprighting and cropping. RAM-Usage goes up.

Seems that from Picture to Picture RAM-Usage goes up. And yesterday it was just a question of time. Today i will continue to edit 2 weddings and will have an eye on what happens...

Exactly what I am seeing - moving from picture to picture in Develop - scrolling along the thumbnails at the bottom takes my LR2015.6 from a start of 2GB in Task Mgr (win10)  up to 6 or 7GB without doing any adjustments.  With adjustments it gets to 11GB and then becomes too slow.  A restart takes it to back to 2GB then it builds again.  I'm restarting LR every 10-15 minutes. Poor...

It seems that there's no need for restarting LR. Just minimize, waiting 2 seconds, maximize and it's working again. Try it!

What are your system specs David?  Processor, RAM, graphics card and driver version, monitor resolution, calibration software even (there was a case a while back with performance problems related to the monitor profile...) and camera model and file type?  And what kind of adjustments have you applied... does it take as long at default settings?

I'm not at my computer right now but it's a late 2014 iMac 27" Retina, 3.3ghz Intel Core i5, 24GB RAM, etc. My system specs haven't changed in over 6 months. These issues just started after I upgraded LR a few days ago. 

When you get back to the computer, just try pausing Sync and see if that helps. Some people are reporting LR 2015.6 syncing their photos and I've seen that cause major performance issues at times.

Oh, and also check whether the GPU is enabled in Preferences or not.

Thanks for the suggestions. GPU is definitely enabled. I've heard some folks recommending to turn that off but that's supposed to be a good thing to offload work from the CPU to a GPU, no?  Not sure what you mean by sync - is that syncing between desktop and mobile? I've never used that and have never even logged into LR mobile before.

Interesting indeed. Were you active on the machine at the time?  What had you been doing?

Processing Canon's 5Ds 50 MPx files, which already were converted to DNG files on a small catalog (both files and pics on SSD) while sitting on my Win 10x64, LR 6.6, 32 GB RAM, i7-6700K computer with Palit GTX 970.

Thanks. Does it continue to climb to crazy levels if you leave it running?

On my machine the amount of RAM used by LR can (sometimes) grow up to 99% ot the total RAM (64GB in my case, iMac 5K, 27", late 2015, 4GHz i7, AMD Radeon 4GB Video, 1GB SSD). Happened on previous versions of LR too. I noticed that performance deteriorates faster and worse when Safari + Mail are both open as well. If I keep them closed, LR takes much longer to deteriorate (like 1h) until a close and reopen os needed.

I can confirm the memory leak. I believe it's due to the change in 6.6 to that caches the Develop module previews for the image files adjacent to the currently selected file (i.e. 3 previews). Simply "browsing" images in the Develop module cause memory usage to climb and not be released. Use of the Adjustment Brush on multiple images is even worse. See this post: https://forums.adobe.com/message/8812806#8812806

Yes, there is prerelease testing. It seems there is a very specific set of circumstances triggering this issue, otherwise there would uproar by now.  Even now, there are only a few of us in this thread that have ever seen this issue, and I spent days trying to figure out how to trigger it.

I'm an Admin in a german LR-Facebook-Group. There are a lot of others having that problem. Don't look just at us few here...
It seems to be triggered by everything. Switching to the next image. Doing with the heal brush. Looks like a memory leak in general.

Great, see if you can get them to post on this thread. The more information the engineers have, the quicker they'll be able to spot a pattern and fix it.

I already tried that for two issues (slow and not remembering import-location) but... Only two people did that. :(
Maybe most of them are not doing that because they're not used in writing in english language.

Feel free to tell them to post in German and we'll Google Translate it.