My web server is (include version): Apache (recent version)
The operating system my web server runs on is (include version): Windows server
I can login to a root shell on my machine (yes or no, or I don’t know): yes
I have a problem of slowness on a website that makes several hundred thousand visitors a month, and since the switch to https.
The website is hosted on a dedicated server and uses for the SSL certificate Let’s Encrypt.
The problem is the following: since the switch to https, there are very significant slowdowns at times (sometimes 20 to 30 seconds to load a page).
In the browser, the load “freezes” for several seconds and is indicated at the bottom "Establishing a TLS connection with …"
The slowdowns have no logic: it can be 1 or 2 days during the week (but not necessarily the same days), at certain times only (but not necessarily the same hours), the slowdown time also differ depending on the case, and it’s not at all related to the traffic on the site at a time T (there can be little traffic and big delays).
In doing a waterfall, we always see the same thing: it is the SSl which is the cause of these slowdowns (precisely “HTTPS handshake time” who is the only cause).
How is it possible ? Is it linked to Let’s Encrypt or a bad configuration of the certificate on the server?
How to solve this problem?
Thank you because it’s really disturbing …