Hey everyone, I think this is a rather complicated thing. My Website is totally optimized on speed with everything I could find on the internet, except for a DNS. But front end and backend are incredibly slow. At some tests it says I should reduce the server response time but on most of the pagespeed tests (also with GTMetrix) I score damn good. But the real speed for first colorful paint is at least four seconds, which is a pain for me and my testers (and future clients)
Is there anyone who has a suggestion what I should check? The Time to first Byte is tested and was green as well. This confuses me because there seems to be no connection between the real speed and the tests.