See At this article how and why use the WordPress comments pagination. Have you noticed that your blog posts with a lot of comments load slower than other posts? That’s because loading so many comments increase server load which increases your average page load time. Having a lot of comments is a good thing because it means that your users are engaged with your content. Your most commented posts are usually the most popular posts on your blog.
Another reason to paginate your WordPress comments is to maintain the keyword density of your articles. Comments add a lot of content to your post’s page, and they may not always include your target keywords in a sufficient amount.
WordPress Comments Pagination Guide
Paginating comments in WordPress is very easy to do. Just follow these simple steps. To start with, log in to your WordPress dashboard and go to Settings > Discussions > Other comment settings. Check the box where it says Break comments into pages and select the number of comments you want to show on each blog posts. You can also select which page to show the Older or Newer comment. Don’t forget to click on the ‘Save Changes’ button to store your settings.
That’s it. all done. Now go to your posts that have a lot of comments and see the comments pagination working on your WordPress site, you will see that instead of showing all comments it shows comments on different pages. Your theme will determine the paginating style. Paginating comments can be a good idea only if you are getting a huge number of comments. Otherwise, you needn’t worry about paginating.
To Paginate or Not
Paginating comments is probably only a good idea if you set the number relatively high. You probably wouldn’t want to set the number at 5 as I did in my example. But if you set it at 25 or more, then even if you don’t normally get a lot of comments, you’ll be all set if a post does happen to generate more discussion than normal.