Rails should be faster and leaner, Rails must have a central page on the rubyonrails.org website dedciated to deployement, scalability and maintenance of rails applications, Rails should have tools to benchmark code and see what sections of the application should be improved to reduce request processing.
Jay Godse commented
Check out the railscast on performance tools at http://railscasts.com/episodes/161-three-profiling-tools. Also, the folks at New Relic have a pile of videos on performance at http://www.bestechvideos.com/2009/03/21/railslab-scaling-rails-episode-4-new-relic-rpm.
That would happen anyway so keep your votes for other tasks :)
The UserVoice forum is to try and give people a voice in which byproducts they consider the most important. But it's not the only determining factor.
Isn't this already going to be a byproduct of the Rails + Merb merger?