How do I optimize Lightroom’s performance?
We’ve put together some of the best practices you can use to optimize Lightroom, as well as get the best performance of Advanced Lightroom Effects.
Adobe has published an extensive list of ideas for increasing the performance of Lightroom, which can be found here
1. Optimize Catalog
The larger the catalog, the slower your Lightroom performance. Keeping your LR catalog below 20k images will give you noticeably faster performance, especially when using our Advanced Lightroom Effects (ALE) packs. Also, be sure to optimize your LR catalog by going to File > Optimize Catalog.
If your catalog is getting too bulky, you might want to consider starting a new one. Some users choose to do this at regular intervals or when they start a new project.