I am using OpenLiteSpeed + Wordpress + LiteSpeed Cache (https://marketplace.digitalocean.com/apps/openlitespeed-wordpress). I don't know why the performance is terrible. Also, when I do load tests, many "SSL handshake failed (5)" errors appear. For the SSL certificate, I got it from Let's Encrypt. Any suggestion? Thanks.
OpenLiteSpeed httpd_config.conf
CPU is idle most of the time.
It seems like your test client issue. Please prepare your client-server in the same area to avoid any network latency issue. For example, I launched a California node and run the same benchmark command, and the result is 8 times faster than yours.
h2load -n 100000 -c 100 -t 1 -T 5 -m 10 -H 'Accept-Encoding: gzip,deflate'
FYI, for such server/network issues, please post in serverfault next time.