Free Ruby on Rails application profiling for developers

The TuneUp developer panel is packaged as a Rails plugin, making installation straightforward.
As you navigate the application, the TuneUp developer panel continually updates high-level metrics about the currently rendered page.
The stacked bar graph illustrates how the overall execution time is distributed across your Models, Views and Controllers.

At any time, you can use the TuneUp developer panel to request further details about the most recently executed action. Why did it take longer to render one page compared to others?
Quickly learn more about what happens under the covers of the Rails framework for each request.
Drill down into the instrumented steps of actions to identify long running model accesses.
Review SQL statements created by ActiveRecord. For each request, TuneUp also executes an EXPLAIN query which can help expose information from the query optimizer of the database.
With one click, upload “Runs” to the FiveRuns TuneUp community site to get help from your team or other developers.

View public “Runs” from other members of the TuneUp developer community.
Look for problems with similar characteristics to those you are experiencing. What performance are these types of applications having?
Comment on public “Runs”. Help your colleagues with their performance challenges. Contribute to the community!

Upload your “Runs” to the TuneUp community site for private or for public viewing and analysis.
View recent activity. Who has commented on your “Runs”? View comments from members of the TuneUp community and suggestions on how to improve your application’s performance.
Does a comment address your performance issue? Mark it as The Answer for the benefit of the community.
Contribute to the community! Comment on other public “Runs” in TuneUp.

Start Tuning Up Your Rails Apps Now! FiveRuns TuneUp is, and always will be a FREE service.