Hi,
I had apache webserver. I was trying nginx and Litespeed to check website speed. When I was on apache everything was fine, I had cpu usage from 3-7% only with 300 online visitors and wp-rocket plugin enabled. I uninstalled apache and installed nginx, I didn't like the results and find difficulties optimize using wp-rocket then I uninstalled it and installed litespeed but also didn't like it, I installed and uninstalled multi times then get back to apache but now I feel cpu usage is not normal like before. it jumps up to %30 or %40 then within a second down to 3 or 5%. I feel something is wrong? how can I troubleshoot please?