Diagnosing the cause of slow view rendering

Question

I\'m not sure when this started, but something unusual is happening in my app (run locally on a development machine). Suddenly I am seeing messages like:

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Answer 1

If you're coming from rails 3.2.13 note that a bunch of people have experienced this issue and reverting to 3.2.12 seems to resolve it. You can find more info here on github.

In my case disabling config.assets.debug sped things up a little, but reverting to 3.2.12 dropped request time from around 4 seconds to around 250ms.