Question

My rails app works fine, but is too slow in rendering from DB. Example: “Completed in 4027ms (View: 3758, DB: 87)”. Rails 2.3.8. How can I improve the html render speed in rails apps?

USING: action.html.erb

Answer 1

I am sure:

1. You are making queries inside your view
2. You are rendering a lot of partial
3. You are nesting rendering partials
4. You are using expensive Ruby operations in your views (sorting, selecting, maping)
5. You are nesting expensive operations (n2, n4… code)

Examples, to explain it:

1. @my_objects = MyObject.where(:foo => :bar).all
2. @my_objects.each{ |object| render object }
3. @my_objects.each{ |object| render object }
   _object.html.erb
   object.children.each{ |child| render child }
4. @my_objects.sort_by{ |a,b| a.id <=> b.id }
5. @my_objects.sort_by{ |a,b| a.map(&:id).last.name <=> b.map(&:id).last.name }