Minor performance improvement for test suite (#4678)

spec/spec_helper.rb

@@ -1,11 +1,15 @@
 require 'simplecov'
 
+GC.disable
+
 SimpleCov.start 'rails' do
   add_group 'Services', 'app/services'
   add_group 'Presenters', 'app/presenters'
   add_group 'Validators', 'app/validators'
 end
 
+gc_counter = -1
+
 RSpec.configure do |config|
   config.expect_with :rspec do |expectations|
     expectations.include_chain_clauses_in_custom_matcher_descriptions = true
@@ -22,8 +26,21 @@ RSpec.configure do |config|
   end
 
   config.after :suite do
+    gc_counter = 0
     FileUtils.rm_rf(Dir["#{Rails.root}/spec/test_files/"])
   end
+
+  config.after :each do
+    gc_counter += 1
+
+    if gc_counter > 19
+      GC.enable
+      GC.start
+      GC.disable
+
+      gc_counter = 0
+    end
+  end
 end
 
 def body_as_json