Rails片段缓存速度较慢？

Question

I'm trying to implement fragment caching in Rails. Without caching, code looks like this:

<div>
  <% data = MyObject.getDataFromDataBase %>

  <!-- complicated divs displaying the 'data', multiple partials -->
</div>

It creates a lot of SQL queries (in the view) and, in overall, takes around:

Completed 200 OK in 1107ms (Views: 1007.0ms | ActiveRecord: 93.6ms)

After wrapping this up with cache like this:

<div>
  <% cache 'my_cached' do %>
    <% data = MyObject.getDataFromDataBase %>

    <!-- complicated divs displaying the 'data', multiple partials -->
  <% end %>
</div>

I see the output (on the second refresh) - NO SQL queries (besides user role check), nothing, just:

 Read fragment views/my_cached/bda6867d8a08ec1637c0c926edced2d2 (0.7ms)
 Completed 200 OK in 1241ms (Views: 1228.7ms | ActiveRecord: 6.8ms)

And my questions is: How its possible, that AFTER caching it takes longer? Nothing happens in the logs, file is loaded in 0.7 ms, why it takes over 1 second overall?

Answer 1

Caching works correctly.

I've used mini profiler to see how rendering works and my page refreshes faster - from 160 ms to around 10 ms. The problem was development mode and application.html.erb file, with loading time around 1 second.