After updating a plugin, the WordPress site suddenly slowed down or even became inaccessible.

This situation is actually quite common, so don't panic 👍 Most cases involve compatibility issues after plugin updates. You can troubleshoot using these steps: First, deactivate any plugins recently updated (even if you need to directly modify folders via FTP). Check your hosting control panel for error logs to see if there are any obvious error messages. Check your PHP version—many plugins have updated version requirements after updates. Disable caching plugins and test again to avoid interference. Roll back the version or switch to an alternative solution, and your site should recover immediately.