Erick Hitter

WordPress 3.0 introduced a native shortlinks feature, which builds URLs using query strings. This plugin converts those URLs to ones using pretty permalinks, which makes for a nicer-looking URL and improves shortlinks’ ability to be cached.
Posts and pages are supported by default, while filters make it possible to support other post types.
For example, https://example.com/?p=123 becomes https://example.com/p/123/.

ETH Simple Shortlinks

Convert WordPress's query-based shortlinks to pretty permalinks that are cacheable. https://example.com/?p=123 becomes https://example.com/p/123/.

ggriesser

Keep your site simple and lean! Slim WordPress by <a href="https://www.velocious.io/" title="Velocious.io" rel="nofollow ugc">Velocious.io</a> helps you to speed up your site by disabling and removing unnecessary WordPress features.
WordPress does not care if you use emoticons or embeds – the corresponding script is loaded on every page regardless if emojis are visible or not.
With Smart WP you are getting back control over these features and you can speed up your WordPress site.
Decide on your own which features are loaded and which are not!
Your users will love it!
By using Slim WordPress you can:
<ul>
<li>Disable emoticons</li>
<li>Disable embeds</li>
<li>Remove shortlinks</li>
<li>Remove WordPress’ version number</li>
</ul>

Slim WordPress

Send your site on a diet and remove unnecessary WordPress features!

ETH Simple Shortlinks vs Slim WordPress