Question

I have a controller action which is taking 10 seconds to run. Most of the time is being spent in a view which is a large file.(more than 1500 lines). How shall I go about debugging the speed issue?

Answer 1

I would suggest to wrap some small pieces of your view into benchmark blocks and see in the log/development.log where are the slow parts.

<% benchmark "Showing users" do %>
  <!-- ... -->
<% end %>

<% benchmark "Performing some calculations" do %>
  <!-- ... -->
<% end %>

The best case will be that you find a few places where 90% time is spent. Then you can work on them to significantly improve the performance.