cleancoded

This plugin cleans and optimizes WordPress code for improved website performance and faster page load times. Whether you’re using a custom child theme or a marketplace theme template, this plugin will clean the code and improve performance.
It adds a variety of site-wide optimization options to the WordPress backend:
<ul>
<li>Disable emojis</li>
<li>Disable embeds</li>
<li>Remove query strings</li>
<li>Disable XML-RPC</li>
<li>Remote jQuery Migrate </li>
<li>Hide WP Version</li>
<li>Remove the wlwmanifest link</li>
<li>Remove the RSD link</li>
<li>Remove the shortlink tag</li>
<li>Disable RSS feeds</li>
<li>Disable RSS feed links</li>
<li>Disable self pingbacks</li>
<li>Remove REST API links</li>
<li>Disable dashicons</li>
<li>Disable Google Maps</li>
<li>Disable Heartbeat</li>
<li>Update Heartbeat frequency</li>
<li>Limit/disable post revisions</li>
<li>Update autosave frequency</li>
<li>Change the login URL</li>
</ul>
WooCommerce optimization options:
<ul>
<li>Diable scripts except on product, cart and checkout pages</li>
<li>Disable cart fragmentation</li>
<li>Disable the status meta box</li>
<li>Disable widgets</li>
</ul>
The plugin also offers CDN rewrite support, a script manager to disable CSS/JS on a page-by-page basis, DNS prefetch and preconnect support, as well as backend accessibility mode.
<h3>Roadmap</h3>
<ul>
<li>Lazy load images</li>
<li>HTTP/2 server push</li>
<li>Sync Google Analytics locally</li>
<li>Delete expired transients</li>
<li>WordPress menu cache</li>
<li>Parse and remove all HTML comments in source code</li>
<li>Disable blog (comments, categories, tags, etc.)</li>
<li>Minify HTML/JS/CSS</li>
<li>Disable Google Fonts</li>
<li>Disable comments globally</li>
<li>White label for marketing agencies</li>
</ul>

Code Cleaner

Code Cleaner cleans and optimizes WordPress code for improved website performance and faster page load times.

pranacoder

WordPress stores a lot of excess information in your DB (like post revisions, auto drafts, spam and trashed comments, transient site options, etc.). 
Of course there’s a reason for that and some of this data is needed once in a while, but most of it is not critical. It just sits there taking up space and never being used. 
Over the time as your site grows the volume of this unused data grows with it making your database unreasonably huge thus effecting the site’s overall performance.
Using WUCO you can easily and safely clean up your database from those useless entries. With a single click you can remove revisions, drafts, auto drafts, orphaned post and comment meta, transient data and much more. You can also schedule the cleanups for later and they will be run automatically keeping your WordPress site clean and shiny.
And as all the best things in life WUCO is and always will be absolutely free.

WUCO – WP Ultimate Cleanup & Optimization

WUCO aka WP Ultimate Cleanup & Optimization, a free easy to use yet effective plugin designed to help you keep your MySQL database clean.

Code Cleaner vs WUCO – WP Ultimate Cleanup & Optimization