diff --git Gemfile Gemfile
index 62d015e..23dfbb7 100644
--- Gemfile
+++ Gemfile
@@ -7,6 +7,7 @@ gem 'fastimage'
 gem 'emot'
 gem 'mail'
 gem 'rake'
+gem 'stackprof'
 
 group :development do
   gem 'pit', require: false
diff --git Gemfile.lock Gemfile.lock
index a5c09a0..d2ed08b 100644
--- Gemfile.lock
+++ Gemfile.lock
@@ -100,6 +100,7 @@ GEM
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sqlite3 (1.3.11)
+    stackprof (0.2.8)
     term-ansicolor (1.3.2)
       tins (~> 1.0)
     test-unit (3.1.8)
@@ -137,6 +138,7 @@ DEPENDENCIES
   simplecov
   sprockets
   sqlite3
+  stackprof
   test-unit
 
 BUNDLED WITH
diff --git spec/spec_helper.rb spec/spec_helper.rb
index 2a8b3c6..bfcfb9e 100644
--- spec/spec_helper.rb
+++ spec/spec_helper.rb
@@ -17,11 +17,21 @@ if ENV['COVERAGE'] = 'simplecov'
 end
 
 require 'tdiary'
-
+require 'stackprof'
 RSpec.configure do |config|
 	config.expect_with :rspec do |c|
 		c.syntax = :expect
 	end
+
+	config.before(:each) do
+		StackProf.start
+	end
+	config.after(:each) do
+		StackProf.stop
+	end
+	config.after(:suite) do
+		StackProf.results('tmp/tdiary.dump')
+	end
 end
 
 class DummyTDiary