If there is something in lsws/logs/stderr.log like: .../lsapi.so: warning: already initialized constant ENV you rails application is powered by LSAPI now.
You may feel the first request is still pretty slow, that's because the RoR framework need to initialization for the first request, it is slow, you can set
Run On Start Up: Yes If you have not.
You will notice big differences when you server is under load, especially when there are cached pages.
We do not use CGI, we use our LSAPI protocol, which is similar to FCGI, more better optimized for performance.