Spring is just around the corner and it's time for a good spring cleaning. Sometimes, actually often, Lightroom can become very messy. A good wash and cleanup can help a lot. The larger the catalog, the messier Lightroom gets.
The simplest and the best way to speedup everything is to delete all the “so-so” photos. All the photos that you have never looked back at since taking them. These are the mediocre photos. These photos do not have a sentimental value and they do not have any technical value.