I've been running Speed Kit (by Baqend) on my Plesk server and it's crazy fast. I went from an 86% to 98% on GTMEtrix! But I want to utilize LiteSpeed as well to get away from Apache/Nginx. I installed the trial of LiteSpeed server and LSCWP plugin on my main site. The speed test results are fast-ish but it slowed down a bit. Are they compatible? Nothing broke, the site is working fine and even if I don't us the LSCWP plugin the benefits of LiteSpeed server are worth it.