Logstash TLS performance troubleshooting

I am suffering from poor TLS handshake performance while connecting to Logstash. While testing using openssl s_client ... and providing client key it takes up to 40 seconds, to finish TLS handshake. This is machine that is under some load and I guess this is a problem, BUT top show very small CPU and memory usage.

How can I troubleshoot this problem? Before I decide to upscale I need to be sure that HW limitations are problem, but maybe something is misconfigured.

Logstash version 5.1.2.

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