Until now, I've faced some issues with some extensions the upgrade to J5 in some projects, so I'm getting a little more time to migrate all my websites to that version. Ensure your host php version is aligned with the needs
Faster and More Efficient
Joomla 5 has been optimized for speed. It takes advantage of modern PHP versions and improved core code, which results in faster page loads and better overall performance.
Improved Accessibility
Joomla 5 adheres to current accessibility standards (like WCAG). This means your website is more inclusive and easier to navigate for users with disabilities.
Modern Codebase
Joomla 5 uses up-to-date coding practices, making it more future-proof and easier for developers to build and maintain custom extensions.
Enhanced Security
With stricter security practices and up-to-date libraries, Joomla 5 offers stronger protection against common vulnerabilities.
Cleaner Backend UX
The admin interface has been refined for a more user-friendly experience, making content and user management smoother, especially for non-technical users.
Backward Compatibility Layer
Joomla 5 includes a "Behavior Compatibility Plugin" to help older Joomla 4 extensions work without breaking immediately, giving developers more time to upgrade.
So I loved this. I am very busy to debug everything of my own components, to disable "Behavior Compatibility Plugin"