diff --git a/Envfile b/Envfile
index 944a3fac..854188e0 100644
--- a/Envfile
+++ b/Envfile
@@ -148,6 +148,11 @@ variable :TRENDING_TAGS, :String, default: "git,beginners"
 variable :FACEBOOK_PIXEL_ID, :String, default: "Optional"
 variable :SMARTY_STREETS_WEB_KEY, :String, default: "Optional"
 
+variable :SKYLIGHT_AUTHENTICATION, :String, default: "Optional"
+variable :NEWRELIC_AUTHENTICATION, :String, default: "Optional"
+
+variable :MINI_PROFILER, :String, default: "Optional"
+
 
 group :production do
   variable :SECRET_KEY_BASE, :String
diff --git a/Gemfile b/Gemfile
index 1a5f4c0b..1f2793f6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -102,6 +102,9 @@ gem "uglifier", "~> 4.1"
 gem "validate_url", "~> 1.0"
 gem "webpacker", "~> 3.5"
 gem "webpush", "~> 0.3"
+gem 'newrelic_rpm'
+gem 'rack-mini-profiler'
+gem "prometheus_exporter"
 
 group :development do
   gem "better_errors", "~> 2.5"
@@ -115,6 +118,7 @@ group :development do
   gem "guard-rspec", "~> 4.7", require: false
   gem "rb-fsevent", "~> 0.10", require: false
   gem "web-console", "~> 3.7"
+  gem 'meta_request'
 end
 
 group :development, :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index c7c050cf..17438503 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -592,6 +592,9 @@ GEM
     memoizable (0.4.2)
       thread_safe (~> 0.3, >= 0.3.1)
     memory_profiler (0.9.12)
+    meta_request (0.7.4)
+      rack-contrib (>= 1.1, < 3)
+      railties (>= 3.0.0, < 7.1)
     method_source (0.9.2)
     mime-types (3.2.2)
       mime-types-data (~> 3.2015)
@@ -612,6 +615,7 @@ GEM
     net-http-persistent (3.0.0)
       connection_pool (~> 2.2)
     netrc (0.11.0)
+    newrelic_rpm (9.1.0)
     nio4r (2.3.1)
     nokogiri (1.10.1)
       mini_portile2 (~> 2.4.0)
@@ -651,6 +655,8 @@ GEM
       ast (~> 2.4.0)
     pg (1.1.4)
     powerpack (0.1.2)
+    prometheus_exporter (2.0.8)
+      webrick
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
@@ -675,8 +681,12 @@ GEM
     pusher-signature (0.1.8)
     raabro (1.1.6)
     rack (2.0.6)
+    rack-contrib (2.3.0)
+      rack (~> 2.0)
     rack-host-redirect (1.3.0)
       rack
+    rack-mini-profiler (3.0.0)
+      rack (>= 1.2.0)
     rack-protection (2.0.4)
       rack
     rack-proxy (0.6.5)
@@ -932,6 +942,7 @@ GEM
     webpush (0.3.2)
       hkdf (~> 0.2)
       jwt
+    webrick (1.8.1)
     websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.3)
@@ -1012,7 +1023,9 @@ DEPENDENCIES
   libhoney (~> 1.11)
   liquid (~> 4.0)
   memory_profiler (~> 0.9)
+  meta_request
   nakayoshi_fork
+  newrelic_rpm
   nokogiri (~> 1.10)
   octokit (~> 4.13)
   omniauth (~> 1.9)
@@ -1020,6 +1033,7 @@ DEPENDENCIES
   omniauth-twitter (~> 1.4)
   parallel_tests (~> 2.27)
   pg (~> 1.1)
+  prometheus_exporter
   pry (~> 0.12)
   pry-byebug (~> 3.7)
   pry-rails (~> 0.3)
@@ -1029,6 +1043,7 @@ DEPENDENCIES
   pusher (~> 1.3)
   pusher-push-notifications (~> 1.0)
   rack-host-redirect (~> 1.3)
+  rack-mini-profiler
   rack-timeout (~> 0.5)
   rails (~> 5.1.6)
   rails-assets-airbrake-js-client (~> 1.5)!
diff --git a/Procfile.profile b/Procfile.profile
new file mode 100644
index 00000000..64554f21
--- /dev/null
+++ b/Procfile.profile
@@ -0,0 +1,3 @@
+web: bin/rails s -p 3000 -e profile
+job: bin/rake jobs:work
+prometheus_exporter: bundle exec prometheus_exporter -a prometheus/custom_collector.rb
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 1531dc97..20130f2c 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -1,6 +1,10 @@
 class ApplicationController < ActionController::Base
   protect_from_forgery with: :exception, prepend: true
 
+  before_action do
+    Rack::MiniProfiler.authorize_request if cookies[:mini_profiler] == ApplicationConfig["MINI_PROFILER"]
+  end
+
   include Pundit
   include Instrumentation
 
diff --git a/app/views/stories/_main_stories_feed.html.erb b/app/views/stories/_main_stories_feed.html.erb
index b6cd0a65..9fb395e7 100644
--- a/app/views/stories/_main_stories_feed.html.erb
+++ b/app/views/stories/_main_stories_feed.html.erb
@@ -55,7 +55,9 @@
     <% if !user_signed_in? && i == 4 %>
       <%= render "stories/sign_in_invitation" %>
     <% end %>
-    <%= render "articles/single_story", story: story %>
+    <% cache(story) do %>
+      <%= render "articles/single_story", story: story %>
+    <% end %>
   <% end %>
 <% end %>
 <% if @stories.size > 1 %>
diff --git a/bin/startup b/bin/startup
index c7e84efb..de393fa5 100755
--- a/bin/startup
+++ b/bin/startup
@@ -11,6 +11,12 @@ def system!(*args)
 end
 
 chdir APP_ROOT do
-  puts "== STARTING UP =="
-  system! "foreman start -f Procfile.dev"
+  env = ENV.fetch('RAILS_ENV', 'development')
+  puts "== STARTING UP #{env}=="
+
+  if env == 'profile'
+    system! "foreman start -f Procfile.profile"
+  else
+    system! "foreman start -f Procfile.dev"
+  end
 end
diff --git a/case-study.md b/case-study.md
new file mode 100644
index 00000000..6b9b3c1d
--- /dev/null
+++ b/case-study.md
@@ -0,0 +1,128 @@
+## Цели
+
+- Попрактиковаться в настройке мониторинга
+- Попрактиковаться в поиске возможностей для оптимизации
+
+- Попрактиковаться в проверке гипотез и обосновании предложений по оптимизации
+- Познакомиться с интересным живым Rails open-source проектом
+
+## Настройка систем профилирования
+
+- Подключил NewRelic
+- Подключил Skylight
+- Подключил Prometheus + Grafana
+
+- Настроил rack-mini-profiler
+- Настроил rails-panel
+
+## Настройка local_production окружения
+
+Добавил новый environment profile - для профилирования в среде максимально приближенной к Production
+
+## Нагрузочное тестирование
+
+Для проверки гипотиз и выстраивания максимально эффективного фидбэк лупа benchmark осуществлял при помощи утилиты ApacheBench.
+
+## Оптимизация
+
+Все инструменты мониторинга показывают, что самой горячей точкой является главная страница, StoriesController#index.
+
+В частности, заметное время занимает рендеринг partial-ов \_single_story.html.erb.
+
+Статистика 200 запросов в ab:
+
+```Benchmarking 127.0.0.1 (be patient)
+Completed 100 requests
+Completed 200 requests
+Finished 200 requests
+
+
+Server Software:
+Server Hostname:        127.0.0.1
+Server Port:            3000
+
+Document Path:          /
+Document Length:        142263 bytes
+
+Concurrency Level:      5
+Time taken for tests:   10.545 seconds
+Complete requests:      200
+Failed requests:        0
+Total transferred:      28537200 bytes
+HTML transferred:       28452600 bytes
+Requests per second:    18.97 [#/sec] (mean)
+Time per request:       263.633 [ms] (mean)
+Time per request:       52.727 [ms] (mean, across all concurrent requests)
+Transfer rate:          2642.73 [Kbytes/sec] received
+
+Connection Times (ms)
+min  mean[+/-sd] median   max
+Connect:        0    0   0.4      0       3
+Processing:    84  258  92.6    260     536
+Waiting:       84  247  89.2    246     498
+Total:         85  258  92.6    260     536
+
+Percentage of the requests served within a certain time (ms)
+50%    260
+66%    301
+75%    328
+80%    339
+90%    378
+95%    412
+98%    455
+99%    489
+100%    536 (longest request)
+```
+
+Скрин NewRelic до оптимизации: https://disk.yandex.ru/i/ocwtqArpKiEQbQ
+
+Рассмотрел гипотезу о том, что можно закешировать <%= render "articles/single_story", story: story %> в \_main_stories_feed.html.erb и это даст заметный эффект.
+
+Статистика 200 запросов в ab после отимизации:
+
+```Benchmarking 127.0.0.1 (be patient)
+Completed 100 requests
+Completed 200 requests
+Finished 200 requests
+
+
+Server Software:
+Server Hostname:        127.0.0.1
+Server Port:            3000
+
+Document Path:          /
+Document Length:        142311 bytes
+
+Concurrency Level:      5
+Time taken for tests:   6.603 seconds
+Complete requests:      200
+Failed requests:        0
+Total transferred:      28546800 bytes
+HTML transferred:       28462200 bytes
+Requests per second:    30.29 [#/sec] (mean)
+Time per request:       165.066 [ms] (mean)
+Time per request:       33.013 [ms] (mean, across all concurrent requests)
+Transfer rate:          4222.22 [Kbytes/sec] received
+
+Connection Times (ms)
+min  mean[+/-sd] median   max
+Connect:        0    0   0.2      0       2
+Processing:    57  162  59.0    154     384
+Waiting:       55  153  56.2    143     374
+Total:         57  162  59.0    154     384
+
+Percentage of the requests served within a certain time (ms)
+50%    154
+66%    173
+75%    184
+80%    203
+90%    254
+95%    289
+98%    319
+99%    347
+100%    384 (longest request)
+```
+
+Изменение графика в NewRelic помле оптимизации https://disk.yandex.ru/i/d40doyOEVx7P2Q
+
+Время ответа для 200 запросов уменьшилось с 10.545 до 6.603 секунд
diff --git a/config/environments/development.rb b/config/environments/development.rb
index ad3b97cb..ff56e943 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -6,7 +6,7 @@ def yarn_integrity_enabled?
 
 Rails.application.configure do
   # Verifies that versions and hashed value of the package contents in the project's package.json
-  config.webpacker.check_yarn_integrity = yarn_integrity_enabled?
+  config.webpacker.check_yarn_integrity = false
 
   # Settings specified here will take precedence over those in config/application.rb.
 
diff --git a/config/environments/profile.rb b/config/environments/profile.rb
new file mode 100644
index 00000000..ce8e11c5
--- /dev/null
+++ b/config/environments/profile.rb
@@ -0,0 +1,123 @@
+Rails.application.configure do
+  # config.middleware.use(Rack::RubyProf, :path => 'ruby-prof-results')
+  # config.middleware.use ProfileMiddleware
+
+  # Verifies that versions and hashed value of the package contents in the project's package.json
+  config.webpacker.check_yarn_integrity = false
+
+  # Settings specified here will take precedence over those in config/application.rb.
+
+  # Code is not reloaded between requests.
+  config.cache_classes = true
+
+  # Eager load code on boot. This eager loads most of Rails and
+  # your application in memory, allowing both threaded web servers
+  # and those relying on copy on write to perform better.
+  # Rake tasks automatically ignore this option for performance.
+  config.eager_load = true
+
+  # Full error reports are disabled and caching is turned on.
+  config.consider_all_requests_local       = false
+  config.action_controller.perform_caching = true
+
+  # Enable Rack::Cache to put a simple HTTP cache in front of your application
+  # Add `rack-cache` to your Gemfile before enabling this.
+  # For large-scale production use, consider using a caching reverse proxy like
+  # NGINX, varnish or squid.
+  # config.action_dispatch.rack_cache = true
+  config.read_encrypted_secrets = true
+
+  # Disable serving static files from the `/public` folder by default since
+  # Apache or NGINX already handles this.
+  config.public_file_server.enabled = ENV["RAILS_SERVE_STATIC_FILES"].present?
+  config.public_file_server.headers = {
+    "Cache-Control" => "public, s-maxage=2592000, max-age=86400"
+  }
+
+  # Compress JavaScripts and CSS.
+  config.assets.js_compressor = Uglifier.new(harmony: true)
+  # config.assets.css_compressor = :sass
+
+  # Do not fallback to assets pipeline if a precompiled asset is missed.
+  config.assets.compile = true
+
+  # Asset digests allow you to set far-future HTTP expiration dates on all assets,
+  # yet still be able to expire them through the digest params.
+  config.assets.digest = true
+
+  # `config.assets.precompile` and `config.assets.version`
+  # have moved to config/initializers/assets.rb
+
+  # Specifies the header that your server uses for sending files.
+  # config.action_dispatch.x_sendfile_header = 'X-Sendfile' # for Apache
+  # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX
+
+  # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
+  # config.force_ssl = true
+
+  # Use the lowest log level to ensure availability of diagnostic information
+  # when problems arise.
+  config.log_level = :debug
+
+  # Prepend all log lines with the following tags.
+  config.log_tags = [:request_id]
+
+  # Use a different logger for distributed setups.
+  # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)
+
+  # Use a different cache store in production.
+  # config.cache_store = :mem_cache_store
+  config.cache_store = :memory_store
+  config.public_file_server.headers = {
+    "Cache-Control" => "public, max-age=172800"
+  }
+
+  config.action_mailer.perform_caching = false
+
+  # Ignore bad email addresses and do not raise email delivery errors.
+  # Set this to true and configure the email server for immediate delivery to raise delivery errors.
+  config.action_mailer.raise_delivery_errors = false
+
+  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
+  # the I18n.default_locale when a translation cannot be found).
+  config.i18n.fallbacks = [I18n.default_locale]
+
+  # Send deprecation notices to registered listeners.
+  config.active_support.deprecation = :notify
+
+  # Use default logging formatter so that PID and timestamp are not suppressed.
+  # config.log_formatter = ::Logger::Formatter.new
+  config.log_formatter = ::Logger::Formatter.new
+  if ENV["RAILS_LOG_TO_STDOUT"].present?
+    logger           = ActiveSupport::Logger.new(STDOUT)
+    logger.formatter = config.log_formatter
+    config.logger = ActiveSupport::TaggedLogging.new(logger)
+  end
+
+  # Timber.io logger
+  send_logs_to_timber = ENV["SEND_LOGS_TO_TIMBER"] || "false" # <---- set to false to stop sending dev logs to Timber.io
+  log_device = send_logs_to_timber == "true" ? Timber::LogDevices::HTTP.new(ENV["TIMBER"]) : STDOUT
+  logger = Timber::Logger.new(log_device)
+  logger.level = config.log_level
+  config.logger = ActiveSupport::TaggedLogging.new(logger)
+
+  # Do not dump schema after migrations.
+  config.active_record.dump_schema_after_migration = false
+
+  config.app_domain = "localhost:3000"
+
+  config.action_mailer.delivery_method = :smtp
+  config.action_mailer.perform_deliveries = true
+  config.action_mailer.default_url_options = { host: config.app_domain }
+  config.action_mailer.smtp_settings = {
+    address: "smtp.gmail.com",
+    port: "587",
+    enable_starttls_auto: true,
+    user_name: ENV["DEVELOPMENT_EMAIL_USERNAME"],
+    password: ENV["DEVELOPMENT_EMAIL_PASSWORD"],
+    authentication: :plain,
+    domain: "localhost:3000"
+  }
+
+  config.action_mailer.preview_path = "#{Rails.root}/spec/mailers/previews"
+end
diff --git a/config/initializers/airbrake.rb b/config/initializers/airbrake.rb
index 0a3fffc7..10fd3a89 100644
--- a/config/initializers/airbrake.rb
+++ b/config/initializers/airbrake.rb
@@ -41,7 +41,7 @@
   # environments.
   # NOTE: This option *does not* work if you don't set the 'environment' option.
   # https://github.com/airbrake/airbrake-ruby#ignore_environments
-  c.ignore_environments = %w[test development]
+  c.ignore_environments = %w[test development profile]
 
   # A list of parameters that should be filtered out of what is sent to
   # Airbrake. By default, all "password" attributes will have their contents
diff --git a/config/initializers/prometheus.rb b/config/initializers/prometheus.rb
new file mode 100644
index 00000000..40e3a5b2
--- /dev/null
+++ b/config/initializers/prometheus.rb
@@ -0,0 +1,6 @@
+if Rails.env != "test"
+  require 'prometheus_exporter/middleware'
+
+  # This reports stats per request like HTTP status and timings
+  Rails.application.middleware.unshift PrometheusExporter::Middleware
+end
diff --git a/config/initializers/timeout.rb b/config/initializers/timeout.rb
index 076288f3..2c230b31 100644
--- a/config/initializers/timeout.rb
+++ b/config/initializers/timeout.rb
@@ -1,4 +1,4 @@
-if Rails.env.development? && ENV["RACK_TIMEOUT_WAIT_TIMEOUT"].nil?
+if (Rails.env.development? || Rails.env.profile?) && ENV["RACK_TIMEOUT_WAIT_TIMEOUT"].nil?
   ENV["RACK_TIMEOUT_WAIT_TIMEOUT"] = "100000"
   ENV["RACK_TIMEOUT_SERVICE_TIMEOUT"] = "100000"
 end
diff --git a/config/newrelic.yml b/config/newrelic.yml
new file mode 100644
index 00000000..41cfbd9e
--- /dev/null
+++ b/config/newrelic.yml
@@ -0,0 +1,70 @@
+#
+# This file configures the New Relic Agent.  New Relic monitors Ruby, Java,
+# .NET, PHP, Python, Node, and Go applications with deep visibility and low
+# overhead.  For more information, visit www.newrelic.com.
+#
+# Generated April 3, 2023
+#
+# This configuration file is custom generated for NewRelic Administration
+#
+# For full documentation of agent configuration options, please refer to
+# https://docs.newrelic.com/docs/agents/ruby-agent/installation-configuration/ruby-agent-configuration
+
+common: &default_settings
+  # Required license key associated with your New Relic account.
+  license_key: <%= ENV["NEWRELIC_AUTHENTICATION"] %>
+
+  # Your application name. Renaming here affects where data displays in New
+  # Relic.  For more details, see https://docs.newrelic.com/docs/apm/new-relic-apm/maintenance/renaming-applications
+  app_name: biggy poppy
+
+  distributed_tracing:
+    enabled: true
+
+  # To disable the agent regardless of other settings, uncomment the following:
+  # agent_enabled: false
+
+  # Logging level for log/newrelic_agent.log
+  log_level: info
+
+  application_logging:
+    # If `true`, all logging-related features for the agent can be enabled or disabled
+    # independently. If `false`, all logging-related features are disabled.
+    enabled: true
+    forwarding:
+      # If `true`, the agent captures log records emitted by this application.
+      enabled: true
+      # Defines the maximum number of log records to buffer in memory at a time.
+      max_samples_stored: 10000
+    metrics:
+      # If `true`, the agent captures metrics related to logging for this application.
+      enabled: true
+    local_decorating:
+      # If `true`, the agent decorates logs with metadata to link to entities, hosts, traces, and spans.
+      # This requires a log forwarder to send your log files to New Relic.
+      # This should not be used when forwarding is enabled.
+      enabled: false
+
+# Environment-specific settings are in this section.
+# RAILS_ENV or RACK_ENV (as appropriate) is used to determine the environment.
+# If your application has other named environments, configure them here.
+development:
+  <<: *default_settings
+  app_name: biggy poppy (Development)
+
+test:
+  <<: *default_settings
+  # It doesn't make sense to report to New Relic from automated test runs.
+  monitor_mode: false
+
+staging:
+  <<: *default_settings
+  app_name: biggy poppy (Staging)
+
+profile:
+  <<: *default_settings
+  app_name: biggy poppy (Profile)
+
+production:
+  <<: *default_settings
+
diff --git a/config/secrets.yml b/config/secrets.yml
index 73f5e05c..f009b75c 100644
--- a/config/secrets.yml
+++ b/config/secrets.yml
@@ -22,3 +22,6 @@ test:
 production:
   secret_key_base: <%= ENV["SECRET_KEY_BASE"] %>
 
+profile:
+  secret_key_base: 42dd7834039ebbea271af22635a6782ee15e519b14629c5276bfcdd4cff841e9926994784bb43a335a8f8c9739bb254ea3afe831839d4dc65654ec7516ec25f0
+
diff --git a/config/skylight.yml b/config/skylight.yml
deleted file mode 100644
index d40c2c26..00000000
--- a/config/skylight.yml
+++ /dev/null
@@ -1,3 +0,0 @@
----
-# The authentication token for the application.
-authentication: <%= ENV['SKYLIGHT_AUTHENTICATION'] %>
diff --git a/config/webpacker.yml b/config/webpacker.yml
index 2dfcd170..472b39f8 100644
--- a/config/webpacker.yml
+++ b/config/webpacker.yml
@@ -54,3 +54,8 @@ production:
 
   # Cache manifest.json for performance
   cache_manifest: true
+
+profile:
+  <<: *default
+  compile: false
+  cache_manifest: true
diff --git a/prometheus/custom_collector.rb b/prometheus/custom_collector.rb
new file mode 100644
index 00000000..e13a2704
--- /dev/null
+++ b/prometheus/custom_collector.rb
@@ -0,0 +1,15 @@
+class CustomCollector < PrometheusExporter::Server::TypeCollector
+  unless defined? Rails
+    require File.expand_path("../../config/environment", __FILE__)
+  end
+
+  def type
+    "spajic_posts"
+  end
+
+  def metrics
+    spajic_posts_gague = PrometheusExporter::Metric::Gauge.new('spajic_posts', 'number of spajic posts')
+    spajic_posts_gague.observe User.find_by_name('Dorthea Paucek').articles.count
+    [spajic_posts_gague]
+  end
+end
diff --git a/prometheus/docker-compose.yml b/prometheus/docker-compose.yml
new file mode 100644
index 00000000..28a0c662
--- /dev/null
+++ b/prometheus/docker-compose.yml
@@ -0,0 +1,24 @@
+version: '2'
+services:
+  dockerhost:
+    image: qoomon/docker-host
+    cap_add: [ 'NET_ADMIN', 'NET_RAW' ]
+    mem_limit: 8M
+    restart: on-failure
+  prometheus:
+    depends_on: [ dockerhost ]
+    image: prom/prometheus:0.18.0
+    volumes:
+      - ./prometheus.yml:/etc/prometheus/prometheus.yml
+    command:
+      - '-config.file=/etc/prometheus/prometheus.yml'
+    ports:
+      - '9090:9090'
+  grafana:
+    image: grafana/grafana:3.0.0-beta7
+    environment:
+      - GF_SECURITY_ADMIN_PASSWORD=pass
+    depends_on:
+      - prometheus
+    ports:
+      - "3030:3000"
diff --git a/prometheus/prometheus.yml b/prometheus/prometheus.yml
new file mode 100644
index 00000000..de2a3fe6
--- /dev/null
+++ b/prometheus/prometheus.yml
@@ -0,0 +1,11 @@
+global:
+  scrape_interval: 5s
+  external_labels:
+    monitor: 'my-monitor'
+scrape_configs:
+  - job_name: 'prometheus'
+    target_groups:
+      - targets: ['localhost:9090']
+  - job_name: 'devdev'
+    target_groups:
+      - targets: ['dockerhost:9394']