SSL slow. Establishing secure connection taking too long?

I have Dedicated server on Hetzner. Server is located in Germany. Server has 256GB RAM 6 CPUs (12 Threads)... In coclusion, it is quite good one. I have CENTOS 7.5. EA4. Problem is with SSL. Every day for about 2 hours we have 40 requests in one second and at that moment finishing requests takes about 20 seconds... show more I have Dedicated server on Hetzner. Server is located in Germany.

Server has 256GB RAM 6 CPUs (12 Threads)... In coclusion, it is quite good one. I have CENTOS 7.5. EA4.

Problem is with SSL. Every day for about 2 hours we have 40 requests in one second and at that moment finishing requests takes about 20 seconds sometimes.

While Non SSL takes 0.5 and lower mostly.

There is some exapmle page here: http://viber.ge/index.php

After few second you will see responce time and it varies a lot.

From 13:00 to 15:30 (UTC+4) SSL requests take the msot time.

Even if u open this link (https://banners.analyticson.com/img/h0r2aZAVOb.jpg) with SSL and without u might see the difference.

I have WHM available and I've noticed ModSecurity and wonder if it might be the problem.

I have already applied most of the setting provided here (https://www.codeclouds.com/blog/cpanel-whm-how-to-increase-your-vps-server-speed/) but they are not much about SSL.

Could anyone point out where should I look to resolve this issue?
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