Lightroom CC adjustment brush issue

First off my computer is fairly capable, it's only around 6 months old and I put 8 GB of ram in it. I was working on a photo with Lightroom yesterday using the adjustment brush - I had chosen a lot of small individual areas in addition to all of the sky in the photo. By the time I was done it would take 4 or 5 minutes just for the screen to redraw after panning a little bit.

Is that a bug in Lightroom, or am I just trying to do too much with it?

I don't have LR5, but we've seen a lot of talk that at least some people have similar problems with using the adjustment brush in the way you describe.

But because I don't have the first hand experience, I'm just bringing this back so some who are in the know can speak up.

Have you done the latest update for LR? I know they are good at working over bugs and issues with the updates, so make sure you are up-to-date!

tonylong wrote in post #16915724
Have you done the latest update for LR? I know they are good at working over bugs and issues with the updates, so make sure you are up-to-date!

I've got the CC subscription, so it should be the latest greatest.

What processor are you running? What programs are running while you're using LR? What kind of hard disk are you using? How many hard disks do you have? What is the size of LR's cache?

MedicinSC wrote in post #16915838
What processor are you running? What programs are running while you're using LR? What kind of hard disk are you using? How many hard disks do you have? What is the size of LR's cache?

It's an Intel Core i5 processor at 3.8 GHz, and as I mentioned it has 8 GB of RAM, running 64 bit Win 7. Just one hard drive, can't remember the details of it. When LR started getting slow I rebooted and didn't have anything else running, that didn't seem to matter.

I've never touched any cache settings for LR, I just now looked and 'camera raw cache' is set at 1 GB and 'video cache' is set at 3 GB.

Camera Raw Cache should be set to a lot higher, I've heard a range of good numbers, but if you want to experiment, try 50GB!

You have plenty of memory. Changing the processor probably isn't an option, and the i5 should be fine anyway. A second hard drive (ssd) would maybe help, but again, is not a solution immediately and may not be in your budget, or you may not have a second drive bay.

Try raising the cache size and see if that does anything.

I'm not an expert. These are just things I thought of, from reading various things online over the last few years.

TLDR; What Tony said.

Did you also have Lens Corrections active, especially the straighten tools? Lens corrections require some complex calculations. The way that LR work means that those must be done in real time. In addition they impact on all the other tools, making those more processor intensive - especially brushes. This can cause some fairly dramatic slow down. I read an Adobe blog post (which I can't find now) in which they recommended doing all your work with Lens Corrections off, the activating it at the end.

Dan Marchant wrote in post #16916066
Did you also have Lens Corrections active, especially the straighten tools? Lens corrections require some complex calculations. The way that LR work means that those must be done in real time. In addition they impact on all the other tools, making those more processor intensive - especially brushes. This can cause some fairly dramatic slow down. I read an Adobe blog post (which I can't find now) in which they recommended doing all your work with Lens Corrections off, the activating it at the end.

Increasing the cache might have helped a little, but THIS seemed to be the major culprit. With the lens corrections turned off the redraw only takes 2 or 3 seconds, which is a major improvement over 3 or 4 minutes.

groundloop wrote in post #16916269
Increasing the cache might have helped a little, but THIS seemed to be the major culprit. With the lens corrections turned off the redraw only takes 2 or 3 seconds, which is a major improvement over 3 or 4 minutes.

Good you figured it out!

The majority of reports of problems like this have turned out to involve the graphis board (GPU). And there seems to be an increase of such reports with the CC version of Photoshop. Photoshop uses the GPU to do a lot of the screen display functions and CC makes more intensive use of the GPU than prior versions (Mercury Engine).

I have the same base config as you (i5, 8GB) and have no such problems. And I use the ACR adjustment brush to paint both large and small masks, with lens correction active. I'm probably just lucky that my video card and drivers are OK.

There are lots of sources to tell what graphics cards are compatible. Here's just the first one that Google shows me:
http://www.studio1prod​uctions.com/Articles/P​hotoShop.htm

While turning off lens corrections may be a work around, it's probably not the best solution. Try updating the video card driver. Try turning off the GPU in Photoshop/Preferences/​Performance. If all else fails, you may need to replace the video card.

Good advice, except that the OP is asking about LR, which is not PS and does not use the GPU. (Disclaimer: LR-CC might be different from perpetual LR, but if it is I have not seen any documentation of this from Adobe.)

One other thing to consider that was not mentioned above (the OP found a solution, but for others) is the size of the monitor. Some people with 27" monitors and/or large multiple monitors have reported slow downs while working with the image full screen. Reducing the amount of screen space used by the image by opening side panels improved performance.

groundloop wrote in post #16915741
I've got the CC subscription, so it should be the latest greatest.

You do realise that if their servers go down, you won't be able to access the software

groundloop wrote in post #16916016
It's an Intel Core i5 processor at 3.8 GHz, and as I mentioned it has 8 GB of RAM, running 64 bit Win 7. Just one hard drive, can't remember the details of it. When LR started getting slow I rebooted and didn't have anything else running, that didn't seem to matter.

I've never touched any cache settings for LR, I just now looked and 'camera raw cache' is set at 1 GB and 'video cache' is set at 3 GB.

When I install a new version of LR, I immediately change the cache to 20gb. I have never had any significant slowdown issues with LR, even when others were having a lot of trouble with LR4. I've used the brushes with dozens of brush strokes with no noticeable slowing, with or without the lens corrections. My system is an Asus laptop, i7 Quad core at 2.3ghz, 16gb ram and a 2gb nVidia graphics card,running Win 7.

groundloop wrote in post #16915741
I've got the CC subscription, so it should be the latest greatest.

Even with CC, you still have to download the updates. I get notifications with the Adobe Creative Cloud program running on my computer. I've updated Photoshop at least 4 times since I've had CC and LR a couple of times.