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MiniProfiler
MiniProfiler allows you to see the speed of a request conveniently on the page. It also shows the SQL queries performed and allows you to profile a specific block of code.
(9 minutes)
Capistrano Tasks
Do you know how to make Capistrano tasks? See how to change default deployment behavior with custom tasks in this episode.
(8 minutes)
Request Profiling
You can use profiling to determine where the performance bottlenecks are in specific Rails actions. Watch this episode for details.
(10 minutes)