ideawu’s Paged Thread Comments, this plugin will not load all comments into memory, it will use MySQL’s LIMIT.
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Edit you theme files,
1. Replace <?php comments_template(); ?> with
<?php if(function_exists('wptc_comments_template')){wptc_comments_template();} else{comments_template();} ?>
2. Add pagination numbers
add this code to the comments.php file where you want the pagination numbers to be shown:
<?php if(function_exists('wptc_comments_pages')): ?> <p class="wptc_comments_pages"><?php wptc_comments_pages(); ?></p> <?php endif; ?>