WordPress 5.5 is now available for download or update in your Dashboard. If you cannot use the backend update, you can download it from hereDownload offline WordPress installation packageUpload and update.
Some key WordPress update contents, please refer to the official blog for detailed update records.official blog。
Speed
Due to lazy loading images, posts and pages feel faster.
Images have a big impact on your story, but sometimes they can make your site look slow.
In WordPress 5.5, images wait to load until they are about to scroll into view. The technical term is „lazy loading“.
On mobile devices, lazy loading also prevents the browser from loading files intended for other devices. This saves data costs for your readers and helps extend battery life.
Search
Say hello to the new sitemap.
WordPress sites work well with search engines.
Now, by default, WordPress 5.5 includes an XML sitemap that helps search engines discover your most important pages from the moment they go live.
So more people will find your site faster, giving you more time to attract, retain, and convert them into subscribers, customers, or whatever fits your definition of success.
Security
Now you can choose to automatically update plugins or themes (or just a few of them) from the screen you've always used.
Automatic updates for plugins and themes
Now you can set plugins and themes to update automatically—yes, you can!—in the WordPress admin. So you always know your site is running the latest available code.
You can also turn automatic updates on or off for each plugin or theme you have installed—all from the same screen you've always used.
Update by uploading a ZIP file
If you want to manually update plugins and themes, it's now easier too—just upload a ZIP file.