Keep plugins up-to-date
Plugins add additional features and functionality to your WordPress website, they can enhance content management control and perform a number of performance-enhancing tasks. Well-supported plugins often release updates with security patches, bug fixes and additional enhancements, but updating plugins can be a bit of a double-edged sword.
While the update may implement important security fixes, it may also conflict with another plugin or may not be compatible with your version of WordPress (if older). By doing some research on the plugin’s page on the WordPress Plugin library, you can see the changelog to identify what changes are included in the update (minor or major) and can also learn if other people have had any problems with the latest release.
If everything looks okay, take note of the plugin version you are currently using (see next paragraph), back up the website first (see above), then update the plugin which will deactivate the old plugin, upload the new plugin, and then activate it again accordingly.
If you run into issues after updating a plugin and something is not working properly or the website is broken altogether, you should restore the previous version of the plugin until you or your web development partner is able to troubleshoot the issue.
WP Rollback is a helpful plugin that lets you quickly and easily rollback any plugin from WordPress.org to a previous version without having to manually add or remove files. It basically works just like updating the plugin, except you’re rolling back to the previous version you were using before the update.
It’s a general rule that the more plugins there are on a WordPress website, the slower the site will be—however, the quality of the plugins plays a big role in how quickly the site runs as well. If one plugin is slowing your site down, you can find a faster one or remove it all together.
More plugins will add more code for a browser to load which can slow it down, so a website with a simple code base will usually load much faster than one with a complicated one. The number of plugins, however, is less important than the quality of them.