slow loading application phusion passenger

Hi
  I have successfully used phusion passenger with my rails application.
But the problem is it takes more time to load the first page. And also
if I load a page and wait for some time then again next time it takes
more time to load the page. Why this happens? Please help

Thanks

http://stackoverflow.com/questions/853532/slow-initial-server-startup-when-using-phusion-passenger-and-rails

Best regards

Peter De Berdt