Some performance measurements

Gemfile.lock

@@ -41,6 +41,7 @@ GEM
     autoprefixer-rails (6.7.7.1)
       execjs
     bcrypt (3.1.11)
+    benchmark-ips (2.7.2)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
     bootstrap-navbar (2.4.0)
@@ -70,6 +71,14 @@ GEM
     css_parser (1.4.10)
       addressable
     debug_inspector (0.0.2)
+    derailed_benchmarks (1.3.2)
+      benchmark-ips (~> 2)
+      get_process_mem (~> 0)
+      heapy (~> 0)
+      memory_profiler (~> 0)
+      rack (>= 1)
+      rake (> 10, < 13)
+      thor (~> 0.19)
     devise (4.2.1)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
@@ -91,10 +100,12 @@ GEM
       railties (>= 3.2, < 5.1)
     gem_config (0.3.1)
     geocoder (1.4.3)
+    get_process_mem (0.2.1)
     globalid (0.3.7)
       activesupport (>= 4.1.0)
     haml (4.0.7)
       tilt
+    heapy (0.1.2)
     i18n (0.8.1)
     jbuilder (2.6.3)
       activesupport (>= 3.0.0, < 5.2)
@@ -123,6 +134,7 @@ GEM
     mailchimp-api (2.0.6)
       excon (>= 0.16.0)
       json (>= 1.7.7)
+    memory_profiler (0.9.8)
     method_source (0.8.2)
     mime-types (3.1)
       mime-types-data (~> 3.2015)
@@ -274,6 +286,7 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
+    stackprof (0.2.10)
     temple (0.7.7)
     thor (0.19.4)
     thread_safe (0.3.6)
@@ -300,6 +313,7 @@ DEPENDENCIES
   byebug
   capybara
   coffee-rails (~> 4.1.0)
+  derailed_benchmarks
   devise
   devise-i18n
   dotenv-rails
@@ -327,6 +341,7 @@ DEPENDENCIES
   simple_form
   slim
   slim-rails
+  stackprof
   uglifier (>= 1.3.0)
   web-console (~> 2.0)