Updated October 2026

A slow Lightroom Classic is one of the fastest ways to lose the joy of editing. Sliders lag, thumbnails take forever to appear, and moving from one photo to the next feels like wading through mud. The good news is that most of the slowdown comes from a handful of settings and habits you can change in an afternoon. This guide walks through the steps to speed up Lightroom Classic, starting with the one that got the most attention when it first arrived (GPU acceleration) and moving through the catalog, previews, storage and hardware tips that Adobe itself recommends.

The steps are based on Adobe’s own performance guidance for Lightroom Classic, which we checked before writing this update. Menu names can shift a little between versions, so if something looks different on your screen, check Help in the app.

Where this started: the GPU update

When Adobe added GPU accelerated editing to Lightroom Classic in 2019, it was a big deal for anyone who edits on a high resolution screen. The welcome screen that appeared after that update described it this way: Lightroom Classic uses your GPU to make editing more responsive, and the improvements are most noticeable in photos with several adjustments, or on high resolution (4K and higher) monitors. The same update also brought color labels for collections, PNG export, library performance improvements in the Folders panel, and batch merge for HDR and panoramas.

Screenshot of the Welcome to Lightroom Classic update window listing GPU Accelerated Editing, Color Labels for Collections, Export photos in PNG, Library Performance Improvements and Batch Merge for HDR and PanoramasSave
The Lightroom Classic welcome screen from the 2019 update that introduced GPU accelerated editing. Screenshot of Adobe’s software.

GPU support has been refined many times since then, but the basic idea has not changed. A graphics processor can take over some of the heavy lifting from your main processor, which matters most when you push a photo through lots of adjustments or drive a large display. That is why the first step below is still the first thing to check.

Step 1: Turn on the graphics processor

This is the setting most people are looking for.

  1. On a Mac, open the Lightroom Classic menu and choose Preferences. On Windows, go to Edit and choose Preferences.
  2. Click the Performance tab.
  3. Find the Use Graphics Processor option. Set it to Auto, or pick the custom setting if you want more control, and make sure the box for using the GPU for image processing is checked.
  4. Close the window and restart Lightroom Classic if it asks you to.

A word of caution from Adobe: if your graphics processor is not compatible with Lightroom, turn the option off. A GPU that is old, or a driver that is out of date, can make things slower or cause display glitches rather than faster. If you see odd colors, flickering or crashes after turning this on, switch it back to off and read Adobe’s GPU troubleshooting guide before trying again.

Step 2: Update the graphics driver

Adobe is clear on this one: use a compatible graphics card and keep its driver current. Driver updates from the card maker often fix exactly the kind of lag, tearing and crashes that people blame on Lightroom. On Windows, check the website of your card’s maker or the update tool that came with it. On a Mac, graphics drivers arrive through system updates, so keeping macOS up to date covers it.

Step 3: Update Lightroom Classic itself

Adobe publishes performance fixes in regular updates. In Lightroom Classic, choose Help and then Check For Updates. If you have put off updating because you are in the middle of a project, finish the project, back up the catalog, and then update. Newer versions are usually faster than the one you are using now, not slower.

Step 4: Check the basics of your computer

Lightroom’s minimum system requirements only describe what it needs to run. Performance improves a lot when you go beyond them. Adobe’s performance guidance points to a few things in particular:

  • A 64-bit, multi-core processor. More cores help, up to about six for the best results. The extra power matters most if you use more than one monitor or a high resolution display.
  • 12 GB of RAM or more. Adobe recommends 12 GB or more, with 4 GB as a bare minimum, and more again if you run Photoshop at the same time. More memory helps most when you import and export, move between photos in Loupe view, or build HDR images and panoramas.
  • A solid state drive. Storing your catalog, previews and image files on an SSD can improve performance noticeably. Adobe suggests using the same SSD for your operating system and program files for the biggest gain.
  • Free space. Keep at least 20 percent of the drive that holds your catalog, previews and images free. A nearly full drive slows everything down.

To see exactly what your computer has, open Lightroom Classic and choose Help, then System Info. It lists your processor, memory, graphics card and more, which is handy when you are trying to work out what to upgrade first.

Step 5: Store the catalog in the right place

Your catalog file (the .lrcat file) should live on a fast internal or external SSD. Adobe notes that catalog files cannot be stored on network drives. Your photos can be on a network drive, but access over a network is slower, so switching between modules or photos takes longer. If you keep your images on a network drive, be ready for that trade off, or keep the photos you are working on right now on a faster local drive.

Step 6: Optimize the catalog

Lightroom Classic constantly writes changes to the catalog. Over time, the catalog’s data structure can get messy and slow. Adobe recommends running File and then Optimize Catalog when performance drops. This makes Lightroom examine the data structure and tidy it. It takes a few minutes on a large catalog, so run it when you are about to take a break.

Digital editing workspace with a tablet and lensSave

While you are in the catalog area, make a habit of backing up. A backup before an update or an optimize is cheap insurance.

Step 7: Handle previews on purpose

Previews are the images Lightroom shows you in Grid view, Loupe view and in the Slideshow, Print and Web modules. How you create them has a big effect on speed. Adobe describes four kinds:

  • Minimal: small, low resolution JPEGs embedded in your photos by the camera. They are the fastest to create.
  • Embedded and Sidecar: larger camera-generated previews that take a little longer.
  • Standard: built by Lightroom using the Camera Raw engine, so they can look different from the minimal or embedded ones, especially if you have applied adjustments.
  • 1:1: a full 100 percent view of the actual pixels, also built with the Camera Raw engine. They take the longest to create.

If you only ask for minimal or embedded previews on import, Lightroom has to build standard and 1:1 previews later, while you are trying to work. That is the lag you feel when you zoom in on a photo for the first time. You have two good options:

  1. Build 1:1 previews on import. In the File Handling panel of the Import window, choose Render Previews and then 1:1. Import takes longer, but the library feels much more responsive afterward.
  2. Import fast, render later. Choose minimal or standard previews on import. Then, when you have time, select the photos in Grid view of the Library module and choose Library, Previews, Render 1:1 Previews. Let it finish before you start editing.

If your preview cache has grown huge, you can clear old previews with Library, Previews, Discard Standard and 1:1 Previews. Lightroom will rebuild them when it needs them.

Step 8: Keep standard previews small

Standard previews take time to create and space to store. Adobe suggests keeping them as small as will still look good on your screen. You can set the size and quality in Catalog Settings, on the File Handling tab. Match the size to your display rather than choosing the biggest option by default. A smaller preview cache helps speed and saves disk space.

Step 9: Pause Sync while you edit

If you sync photos with Lightroom on the web, mobile or desktop, syncing uses processor power and your internet connection to create previews and upload or download images. Adobe recommends pausing Sync With Lightroom while you import and edit on your desktop. When you are done for the day, resume it and leave the application open overnight so syncing can finish.

Step 10: Be careful with high resolution displays

Drawing to the screen can be slow when Lightroom fills the entire screen of a high resolution display. Adobe describes displays near 2560 by 1600, such as 30 inch monitors and Retina MacBooks. If you feel lag on one of these, try making the Lightroom window smaller, or use the 1:2 or 1:3 views in the Navigator panel while you work.

Step 11: Check Photoshop’s memory settings

If you send photos from Lightroom Classic to Photoshop, the two programs share your computer’s memory. Adobe suggests checking Photoshop’s RAM setting. In Photoshop, open Preferences and then Performance (under the Photoshop menu on a Mac, or Edit on Windows), and make sure Photoshop is not claiming so much memory that Lightroom is starved.

Smaller habits that add up

  • Close what you are not using. Browsers with many tabs, video calls and other editors all compete for memory.
  • Edit in batches. Select your keepers first, then edit. Fewer photos in play means less for Lightroom to keep up with.
  • Cull before you edit. Removing the obvious rejects early keeps your catalog lean. Our guide on culling wedding photos faster covers a workflow that works for any large shoot.
  • Restart now and then. A fresh start clears out memory that has been building up over a long session.
  • Stay organized. Keep your files in a clear folder structure and use collections, so you are not scrolling through tens of thousands of images to find what you need.

The other features from that 2019 update

The update that added GPU editing also brought a few workflow tools that are still useful today.

Color labels for collections

Go to your Collections panel, right-click a collection, collection set or smart collection, and choose the option to add a color label to it. Pick a color. It is a simple way to mark projects by status, such as editing, delivered or archived.

Export as PNG

Lightroom Classic can export photos in the PNG format. When you open the Export window, look under File Settings and choose PNG from the image format list. Importing PNG files was already supported.

Batch merge for HDR and panoramas

Group your bracketed or panorama sets into stacks first. Then select the stacks, and choose the merge option you want (HDR or Panorama). Lightroom builds one merged image for each stack. If you want the new files to stay grouped with the originals, check the option to create stacks in the merge dialog.

Laptop and external drives on a deskSave

A simple order to try things in

If you only have ten minutes, try these in order and test the speed after each one:

  1. Update Lightroom Classic.
  2. Update your graphics driver, then check the Use Graphics Processor setting.
  3. Free up space so your drive is at least 20 percent empty.
  4. Run Optimize Catalog.
  5. Render 1:1 previews for the shoot you are about to edit.
  6. Pause sync during your editing session.

If Lightroom is still slow after all of that, the cause is probably hardware. Memory and a solid state drive are usually the best places to put your money first.

Keep learning Lightroom

Speed makes editing less painful, but the bigger win is knowing what you are doing once the sliders respond. The Shut Your Aperture Academy has a full Lightroom editing course taught by Edin Chavez, with 10 modules and 42+ parts, and lifetime access. It covers the Develop module, color, masking and workflow from start to finish. You can see everything else at the Academy home page. If you want a worked example once your catalog is running smoothly, try our post on how to create a dramatic oceanscape in Lightroom.

Frequently asked questions

How do I speed up Lightroom Classic?

Update the app and your graphics driver, check that Use Graphics Processor is set correctly in Preferences under Performance, keep at least 20 percent of your drive free, optimize the catalog, render previews on purpose, and pause sync while you edit.

Does the GPU setting always make Lightroom faster?

No. It helps most with many adjustments and high resolution screens. If your graphics card is not compatible, or its driver is out of date, turn the option off.

How much RAM does Lightroom Classic need?

Adobe recommends 12 GB or more for the best performance. Four GB is a bare minimum, and you need more if you run Photoshop at the same time.

Should I keep my catalog on an SSD?

Yes, if you can. Adobe says storing catalogs, image files and previews on a solid state drive can improve performance. Catalogs cannot be stored on a network drive.

What does Optimize Catalog do?

It examines the catalog’s data structure and makes sure it is tidy. Run it from the File menu when performance slows down.

Why is Lightroom slow the first time I zoom into a photo?

It is probably building a standard or 1:1 preview on the spot. Render 1:1 previews on import, or select your photos and render them before you edit.

Gear box: research starting points

If your computer is the bottleneck, these are starting points for your own research. Compare specs and reviews before you buy.

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