diff --git a/config/environments/test.rb b/config/environments/test.rb
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -8,18 +8,18 @@
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
-  config.cache_classes = false
-  config.action_view.cache_template_loading = true
+  # Turn false under Spring and add config.action_view.cache_template_loading = true.
+  config.cache_classes = true
 
-  # Do not eager load code on boot. This avoids loading your whole application
-  # just for the purpose of running a single test. If you are using a tool that
-  # preloads Rails for running tests, you may have to set it to true.
-  config.eager_load = false
+  # Eager loading loads your whole application. When running a single test locally,
+  # this probably isn't necessary. It's a good idea to do in a continuous integration
+  # system, or in some way before deploying your code.
+  config.eager_load = ENV["CI"].present?
 
   # Configure public file server for tests with Cache-Control for performance.
   config.public_file_server.enabled = true
   config.public_file_server.headers = {
-    'Cache-Control' => "public, max-age=#{1.hour.to_i}"
+    "Cache-Control" => "public, max-age=#{1.hour.to_i}"
   }
 
   # Show full error reports and disable caching.