You may have heard this recommendation from Google or an SEO person that your web pages are loading too slow. Google will downgrade your website if it is slow.
This could be due to many factors. Your host server that your website resides on could be slow. You might have large images or too many images loading on the home page. In the case of a WordPress website, the database connection could be slowing down your page loads.
While you should seek a faster host servers for your website and you should also make sure that your images are optimized to load quickly. If that isn’t enough, you could add a plugin to your WordPress site that will cache your website files. What this means is that the cache plugin makes a copy of your site files and optimizes it so that your pages load faster.
When you are editing your website, you might notice that when you save a new page or make a change, you can’t see the new edit on the web. It is because your cache plugin is displaying the old cached data. You need to flush the cache to make it re-optimize the site and to include the new changes.
There are many Site Cache plugins to choose from. From your dashboard in WordPress go to Plugins, Add New, then look to Browse for New plugins. Use “Cache” as your search term. Look at which ones are the most popular and most downloaded. The best I see is Wp Super Cache by Automattic. There are a lot of settings but you can just accept the default settings. W3 Total Cache would be my second choice by Frederick Townes.