http://www.zedshaw.com/projects/scgi_rails/faq.html

Q:  It's really slow when I start it up and seems to leak memory.

A: You’re running it in development mode. You most likely configured
your processor with “-e development” so all you need to do is:

scgi_ctrl config -M -e development
scgi_ctrl restart

This “merges” (-M) your previous configuration with the new config
of “-e development” and then restarts your processor.

XD