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Easy Mark
Inspiring
June 10, 2019
Question

Lightroom Classic So Slow / Laggy on Windows 10

  • June 10, 2019
  • 3 replies
  • 5487 views

Lightroom Classic can be REALLY SLOW on my computer. It seems that it got a LOT slower for me about 6 months ago after a Windows 10 update. While my computer isn't bleeding edge, it is still respectable.

Very laggy adjustment brushes. Often I have to wait 10 to 15 seconds when switching from one photo to the next in the filmstrip in the develop module for the photo to load. Exporting 20 photos (from jpgs to jpgs) now often takes 7 minutes where in the past it took about a minute and a half.

Sometimes when Lightroom is at rest (I am just letting it sit there), my computers fan will start spinning up and lightroom will be using 50% of the CPU for two minutes straight, when I am literally not doing anything.

Sometimes when clicking on the magnify icon to zoom in, or when switching between photos by clicking on the film stirp, the screen will go black for about 10 seconds and I will get a "not responding" message at the top bar of lightroom and a spinning blue circle replaces my cursor.

I have removed any third party plugins that I could remove.

On the other hand, if I use the Camera RAW filter within photoshop, I don't seem to have the slowdowns / lag issues.

I usually edit 24MP Sony RAW files from my a6500.

LR Classic 6.3.1

ACR: 11.3

i7-6770 @ 3.4 GHZ

Win 10 64-bit Version 10.0.17763 Build 17763

24GB RAM

500 GB SSD (System and Lightroom App, and RAW files) with about 240 GB Free Space

250 GB SSD (Lightroom Cache and Previews) with about 90 GB Free Space.

GTX 960 2GB VRAM

In Performance preferences, I have:

Use Graphics Processor: Checked  (GTX 960 2GB VRAM)

Camera RAW Cache Settings: Max Size: 30 GB

Use Smart Previews instead of Originals is Checked.

Generate Previews in Parallel is Checked.

Also, I have tried uninstalling and reinstalling lightroom. This didn't help.

Thanks in advance for thoughts on how to get Lightroom back to it's old self.

    This topic has been closed for replies.

    3 replies

    GoldingD
    GoldingD
    Legend
    June 10, 2019

    Would have thought I previously stated this, but anyhow.

    ”It seems that it got a LOT slower for me about 6 months ago after a Windows 10 update’

    Windows updates, and incidentally GPU driver updates can alter settings you may have made to the OS, and to preferences and so forth to GPU drivers.

    Some of the Windows defaults are designed to keep general users happy, might make multitasking better, might make simpler programs like word processors, etc happier, but can slow done creative types of programs like pretty much any post processing photography software, including PS, LR.

    Not at a PC right now, so some of this from poor memory.

    In the OS the power options as in use of CPU might have reverted to “balanced”, while you will want High Performance..

    In the OS lots of pretty do-dads might be switched back on, things to make the desktop prettier, animations, pop up aids, coretna or whatever, lots of crap

    As for the GPU driver, some options on how it behaves with specific programs might revert to defaults upon an update. I see you have NVIDIA, will look up a link

    E
    Easy MarkAuthor
    Inspiring
    June 10, 2019
    In the OS the power options as in use of CPU might have reverted to “balanced”, while you will want High Performance..

    Yes, I have it set to High Performance.

    As for the GPU driver, some options on how it behaves with specific programs might revert to defaults upon an update. I see you have NVIDIA, will look up a link

    For what it is worth, I have just double checked and do have the latest graphics card driver from Nvidia installed.

    dj_paige
    dj_paige
    Legend
    June 10, 2019

    Laggy adjustment brushes is a known problem in Lightroom, particularly if you are doing a lot of brusing, and particularly if you have a 4K or larger monitor. The GPU acceleration should be OFF, this will speed up local adjustments (but other aspects of LR may be slower)

    You don't say what size monitor you have, in pixels (not inches). This makes a difference. If it is larger than 1920x1200 (or 1920x1080) then try setting the monitor resolution to 1920x1080, restart the computer, and see if this helps.

      E
      Easy MarkAuthor
      Inspiring
      June 10, 2019

      Thank you for the reply.

      Firstly, my monitor is 2560 X 1440. That is the recommended resolution in the Windows display control panel setting. I don't know if it makes a difference, but it is scaled to 125%, which is also recommended by the Windows display control panel setting.

      When I say the brushes are laggy, I mean making one stroke and having to wait 5 seconds for it to show the effect. I generally do only one adjustment brush per image (usually lighten shadows), but that one brush might have several strokes (usually covering about 1/4th to 1/3rd of the image). I am not sure if that is the type of lag that is typical for most users when using the adjustment brush.

      Just so I understand, will using GPU acceleration ALWAYS mean adjustment brushes are laggy / slower? Or does a GPU just need a certain amount of VRAM / CUDA cores / clock speed for it to actually increase the speed of adjustment brushes?

      Any thoughts on why LR might use 50% CPU when my computer is at rest? I look at resource monitor and I don't see any networking activity going on with LR or creative cloud doing any connections to the internet in the background.

      And is 30GB too small for the Camera RAW Cache size??? Is it too big??? (It is on a separate SSD from the one that my system, LR app, catalog and images are on).

      When I look at the memory usage, I usually have around 10 or 12 GB of RAM in Standby, so there should be plenty of RAM available.

      dj_paige
      dj_paige
      Legend
      June 10, 2019

      https://forums.adobe.com/people/Easy+Mark  wrote

      Just so I understand, will using GPU acceleration ALWAYS mean adjustment brushes are laggy / slower? Or does a GPU just need a certain amount of VRAM / CUDA cores / clock speed for it to actually increase the speed of adjustment brushes?

      Turning on GPU acceleration slows down brushing. ALWAYS, as far as I know.

      Any thoughts on why LR might use 50% CPU when my computer is at rest? I look at resource monitor and I don't see any networking activity going on with LR or creative cloud doing any connections to the internet in the background.

      Face detection might be on, previews might be in the process of being generated, Lightroom Classic may be uploading images to cloud storage (although in this case you say this is not happening).

      And is 30GB too small for the Camera RAW Cache size??? Is it too big??? (It is on a separate SSD from the one that my system, LR app, catalog and images are on).

      When I look at the memory usage, I usually have around 10 or 12 GB of RAM in Standby, so there should be plenty of RAM available.

      None of this slowness problem is related to disk or cache or RAM.

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