Hi, thank you. I can see the difference but unfortunately I’m not able to identify what can be wrong.
This is a report for an old post (you can read the post content almost immediately): https://gtmetrix.com/reports/theravens.cz/dCttUraJ
This is a report for a new post but exactly the same content as for the old post (you need to wait about 5 seconds to be able to read post content): https://gtmetrix.com/reports/theravens.cz/poif3XxD