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:

Sta         


        

Answer 1

Ok, I figured it out (at long last). Without changing any of my actual assets I am now seeing this is development:

Started GET "/" for 127.0.0.1 at 2013-03-11 23:14:33 +1300
Processing by PagesController#home as HTML
Rendered pages/home.html.erb within layouts/application (1.3ms)

It turns out the delay was being caused by config.assets.debug = true inside of development.rb. Setting this to false resolves the problem.

Looks like the Rails core team debated turning this off by default, but decided against the idea. In the future I'd love to see them put something in the comment section of development.rb to tip off users of the potential for significant delays.

May I suggest the following:

# Expands the lines which load the assets 
# May cause significant delays in view rendering

Great, they heard me muttering and updated rails!