Joomla 4 is a major improvement over Joomla 3. Right out of the box you get a very fast CMS with built–in support for structured data (what was formerly called “microdata”), even several caching options to cater for any use, from lightweight persona sites to massive, busy portals.
Read more https://magazine.joomla.org/all-issues/november-2021/joomla-4-performance-tuning-part-i
