Lightroom classic very slow

Does this happen all the time, or only when you perform local adjustments, like brushing or spot healing?

How big (in pixels or megapixels, not megabytes) are your original images?

How big is your monitor (in pixels, not inches)?

Have you tried turning your GPU acceleration (Preferences->Performance->Use Graphics Processor) on or off? Is one better than the other?

Hi,

We're sorry about the trouble with Lightroom Classic. Would you mind sharing the version of Lightroom Classic you're using along with your computer's macOS version? Is the catalog saved on an external drive?

The fan of the Macbook running on full may indicate that the Mac is heating up & the system is trying to run the fan that high to cool it down. In these cases, the machine may reduce its processing speed to conserve itself (this is called thermal throttling).

You can try adding Lightroom Classic to the Accessibility list for macOS along with Full disk access using the steps suggested here: https://community.adobe.com/t5/lightroom-classic-discussions/quick-tips-how-to-give-full-disk-access-to-lightroom-classic-on-macos/td-p/12913413

If the issue persists, you can try to reset the preferences of Lightroom using the steps mentioned here: https://adobe.ly/2JSym5e

Please backup your presets prior to resetting the preferences.

Let us know how it goes!

Regards,

Nikunj