diff --git a/Gemfile b/Gemfile
index 7474efb3a..b417a8d2e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -121,7 +121,7 @@ end
 group :development do
   gem 'active_record_query_trace', '~> 1.5'
   gem 'annotate', '~> 2.7'
-  gem 'better_errors', '~> 2.4'
+  gem 'better_errors', '~> 2.5'
   gem 'binding_of_caller', '~> 0.7'
   gem 'bullet', '~> 5.7'
   gem 'letter_opener', '~> 1.4'
diff --git a/Gemfile.lock b/Gemfile.lock
index 0b1a2c579..13c1127b0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -92,7 +92,7 @@ GEM
     aws-sigv4 (1.0.3)
     bcrypt (3.1.12)
     benchmark-ips (2.7.2)
-    better_errors (2.4.0)
+    better_errors (2.5.0)
       coderay (>= 1.0.0)
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
@@ -103,7 +103,7 @@ GEM
     brakeman (4.3.1)
     browser (2.5.3)
     builder (3.2.3)
-    bullet (5.7.5)
+    bullet (5.7.6)
       activesupport (>= 3.0.0)
       uniform_notifier (~> 1.11.0)
     bundler-audit (0.6.0)
@@ -539,14 +539,14 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.4.4)
       nokogumbo (~> 1.4)
-    sass (3.5.6)
+    sass (3.6.0)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    scss_lint (0.57.0)
+    scss_lint (0.57.1)
       rake (>= 0.9, < 13)
-      sass (~> 3.5.5)
+      sass (~> 3.5, >= 3.5.5)
     sidekiq (5.2.2)
       connection_pool (~> 2.2, >= 2.2.2)
       rack-protection (>= 1.5.0)
@@ -654,7 +654,7 @@ DEPENDENCIES
   addressable (~> 2.5)
   annotate (~> 2.7)
   aws-sdk-s3 (~> 1.21)
-  better_errors (~> 2.4)
+  better_errors (~> 2.5)
   binding_of_caller (~> 0.7)
   bootsnap (~> 1.3)
   brakeman (~> 4.3)
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index c002017ef..e9b48fa98 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -82,4 +82,20 @@ module ApplicationHelper
     output << 'rtl' if locale_direction == 'rtl'
     output.reject(&:blank?).join(' ')
   end
+
+  def cdn_host
+    ENV['CDN_HOST'].presence
+  end
+
+  def cdn_host?
+    cdn_host.present?
+  end
+
+  def storage_host
+    ENV['S3_ALIAS_HOST'].presence || ENV['S3_CLOUDFRONT_HOST'].presence
+  end
+
+  def storage_host?
+    storage_host.present?
+  end
 end
diff --git a/app/views/accounts/_og.html.haml b/app/views/accounts/_og.html.haml
index a583b39c2..de948ec6a 100644
--- a/app/views/accounts/_og.html.haml
+++ b/app/views/accounts/_og.html.haml
@@ -1,7 +1,11 @@
+- description = account_description(account)
+
+%meta{ name: 'description', content: description }/
+
 = opengraph 'og:url', url
 = opengraph 'og:site_name', site_title
 = opengraph 'og:title', yield(:page_title).strip
-= opengraph 'og:description', account_description(account)
+= opengraph 'og:description', description
 = opengraph 'og:image', full_asset_url(account.avatar.url(:original))
 = opengraph 'og:image:width', '120'
 = opengraph 'og:image:height', '120'
diff --git a/app/views/layouts/application.html.haml b/app/views/layouts/application.html.haml
index 36b4e9cae..7d3daf6c9 100755
--- a/app/views/layouts/application.html.haml
+++ b/app/views/layouts/application.html.haml
@@ -3,6 +3,13 @@
   %head
     %meta{ charset: 'utf-8' }/
     %meta{ name: 'viewport', content: 'width=device-width, initial-scale=1' }/
+
+    - if cdn_host?
+      %link{ rel: 'dns-prefetch', href: cdn_host }/
+
+    - if storage_host?
+      %link{ rel: 'dns-prefetch', href: storage_host }/
+
     %link{ rel: 'icon', href: favicon_path, type: 'image/x-icon' }/
     %link{ rel: 'apple-touch-icon', sizes: '180x180', href: '/apple-touch-icon.png' }/
     %link{ rel: 'mask-icon', href: '/mask-icon.svg', color: '#2B90D9' }/
diff --git a/app/views/shared/_og.html.haml b/app/views/shared/_og.html.haml
index 76db511cd..802d8c41d 100644
--- a/app/views/shared/_og.html.haml
+++ b/app/views/shared/_og.html.haml
@@ -1,9 +1,13 @@
 - thumbnail = @instance_presenter.thumbnail
+- description = strip_tags(@instance_presenter.site_short_description.presence || @instance_presenter.site_description.presence || t('about.about_mastodon_html'))
+
+%meta{ name: 'description', content: description }/
+
 = opengraph 'og:site_name', t('about.hosted_on', domain: site_hostname)
 = opengraph 'og:url', url_for(only_path: false)
 = opengraph 'og:type', 'website'
 = opengraph 'og:title', @instance_presenter.site_title
-= opengraph 'og:description', strip_tags(@instance_presenter.site_short_description.presence || @instance_presenter.site_description.presence || t('about.about_mastodon_html'))
+= opengraph 'og:description', description
 = opengraph 'og:image', full_asset_url(thumbnail&.file&.url || asset_pack_path('preview.jpg', protocol: :request))
 = opengraph 'og:image:width', thumbnail ? thumbnail.meta['width'] : '1200'
 = opengraph 'og:image:height', thumbnail ? thumbnail.meta['height'] : '630'
diff --git a/app/views/stream_entries/_og_description.html.haml b/app/views/stream_entries/_og_description.html.haml
index 3d122b94e..a7b18424d 100644
--- a/app/views/stream_entries/_og_description.html.haml
+++ b/app/views/stream_entries/_og_description.html.haml
@@ -1 +1,4 @@
-= opengraph 'og:description', status_description(activity)
+- description = status_description(activity)
+
+%meta{ name: 'description', content: description }/
+= opengraph 'og:description', description