Find out the performance of your rails site using yslow. YSlow requires the indispensable Firebug extension.
Download it from https://addons.mozilla.org/en-US/firefox/addon/5369/
YSlow checks your site in 13 scenarios as follows :-
Make Fewer HTTP Requests
Use a Content Delivery Network
Add an Expires Header
Put CSS at the Top
Move Scripts to the Bottom
Avoid CSS Expressions
Reduce DNS Lookups
Remove Duplicate Scripts
app/views/layouts/application.rhtml). Remember to use
stylesheet_link_merged :base and
By using asset packager you can also verify that scripts are only included once – another performance hit otherwise!