Slow activeadmin index page

Question

I have Rails 5 with active admin gem working. In development I saw a lot of queries when run with rail s . Most of them are of type CACHE(0.0ms) . Finally after some seconds it shows:

 Rendered /home/blabla/.rvm/gems/ruby-2.2.5@test/gems/activeadmin-1.0.0.pre4/app/views/active_admin/resource/index.html.arb (10588.9ms)
Completed 200 OK in 10646ms (Views: 10338.2ms | ActiveRecord: 264.1ms)

Is the render view time the problem? In the index view I show a lot of information about some model an its associations. Also I add scoped_collection method with some includes for eager loading, but it is the same, It is tooo slow.... I appreciate any help...

Thank you!

Answer 1

This is likely due to the filters. You can specify the filters you want to include, otherwise all attributes on the model will be added as a filter. https://github.com/activeadmin/activeadmin/blob/master/docs/3-index-pages.md .

Answer 2

The CACHE ones are fine. This means that ActiveRecord already has the data and has not needed to do a DB call.

To diagnose the problem, I'd recommend the bullet gem , which will highlight slow queries caused by missing includes for you. To really drill down into performance, you could try the rack mini-profiler gem with the flamegraph extension. I've had success with these in diagnosing the issues causing the slownewss. Often it's an N+1 issue, but also the development version will recompile all the CSS every time you make an edit.

Speeding up ActiveAdmin by using includes is pretty simple:

controller do
  def scoped_collection
    super.includes(:bill_address)
  end
end

Be aware that rendering in production will not include compiling assets on the fly, so this can be significant in development but not really an issue.