Avoid eager load

According to my testing, it did not provide a great benefit on
subsequent runs, but in my app it made the initial load go from about 4
seconds to 8.

Therefore better to avoid it in this use case I think.

Author: jonleighton

lib/spring/application.rb

@@ -26,6 +26,12 @@ def start
         ActiveSupport::Dependencies.mechanism = :load
       end
 
+      # Ensure eager loading does not take place, even though it usually would do
+      # in test mode with config.cache_classes = true. Eager loading in this situation
+      # just makes the initial run take longer without much gain in subsequent runs,
+      # at least in my testing.
+      Rails::Application::Finisher.initializers.delete_if { |i| i.name == :eager_load! }
+
       require Spring.application_root_path.join("config", "environment")
 
       Rails.application.config.cache_classes = false