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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)
Sidekiq
Sidekiq allows you to move jobs into the background for asynchronous processing. It uses threads instead of forks so it is much more efficient with memory compared to Resque.
(10 minutes)
Delayed Job
Is there a long running task which should be handled in the background? One of the best ways is using the delayed_job plugin like I show in this episode.
(10 minutes)