diff --git a/app/helpers/breadcrumbs_helper.rb b/app/helpers/breadcrumbs_helper.rb
index 56bbb8642..04e581c25 100644
--- a/app/helpers/breadcrumbs_helper.rb
+++ b/app/helpers/breadcrumbs_helper.rb
@@ -2,7 +2,9 @@ module BreadcrumbsHelper
   include DiscussionsHelper
 
   def breadcrumbs(e, extra=nil)
-    breadcrumbs0(e.navigable_name, e, extra, 'last')
+    Rails.cache.fetch [:breadcrumb, e, extra, Organization.current] do
+      breadcrumbs0(e.navigable_name, e, extra, 'last')
+    end
   end
 
   def header_breadcrumbs(link_for_organization: true)
diff --git a/app/helpers/icons_helper.rb b/app/helpers/icons_helper.rb
index 0c92b68c5..fe0523a14 100644
--- a/app/helpers/icons_helper.rb
+++ b/app/helpers/icons_helper.rb
@@ -7,9 +7,9 @@ def fixed_fa_icon(name, options = {})
     fa_icon name, options.merge(class: 'fa-fw fixed-icon')
   end
 
-  def exercise_status_icon(exercise)
-    link_to exercise_status_fa_icon(exercise),
-            exercise_path(exercise) if current_user?
+  def assignment_status_icon(assignment)
+    link_to contextualization_fa_icon(assignment),
+            exercise_path(assignment.exercise) if current_user?
   end
 
   def language_icon(language)
@@ -22,10 +22,6 @@ def contextualization_fa_icon(contextualization)
     fa_icon(*icon_for(contextualization))
   end
 
-  def exercise_status_fa_icon(exercise)
-    contextualization_fa_icon(exercise.assignment_for(current_user))
-  end
-
   def discussion_status_fa_icon(discussion)
     contextualization_fa_icon(discussion)
   end
@@ -35,10 +31,6 @@ def icon_for(iconizable)
     [iconized[:type], class: "text-#{iconized[:class]} status-icon"]
   end
 
-  def class_for_exercise(exercise)
-    icon_class_for(exercise.assignment_for(current_user))
-  end
-
   def icon_class_for(iconizable)
     iconizable.iconize[:class].to_s
   end
diff --git a/app/helpers/links_helper.rb b/app/helpers/links_helper.rb
index b8d2a1ee7..c24d36d04 100644
--- a/app/helpers/links_helper.rb
+++ b/app/helpers/links_helper.rb
@@ -1,8 +1,10 @@
 module LinksHelper
 
   def link_to_path_element(element, options={})
-    name = extract_name element, options
-    link_to name, element, options
+    mode = options[:mode]
+    Rails.cache.fetch [:link, element, mode, Organization.current] do
+      link_to extract_name(element, mode), element
+    end
   end
 
   def link_to_error_404
@@ -65,15 +67,8 @@ def turbolinks_enable_for(exercise)
 
   private
 
-  def extract_name(named, options)
-    case options.delete(:mode)
-      when :plain
-        named.name
-      when :friendly
-        named.friendly
-      else
-        named.navigable_name
-    end
+  def extract_name(named, mode )
+    mode == :plain ? named.name : named.navigable_name
   end
 
   def edit_link_to_bibliotheca
diff --git a/app/helpers/progress_bar_helper.rb b/app/helpers/progress_bar_helper.rb
index 3346715f4..3dc7be052 100644
--- a/app/helpers/progress_bar_helper.rb
+++ b/app/helpers/progress_bar_helper.rb
@@ -1,8 +1,8 @@
 module ProgressBarHelper
   include IconsHelper
 
-  def class_for_progress_list_item(exercise, active)
-    "progress-list-item text-center #{class_for_exercise(exercise)} #{active ? 'active' : ''}"
+  def class_for_progress_list_item(assignment, active)
+    "progress-list-item text-center #{icon_class_for(assignment)} #{active ? 'active' : ''}"
   end
 
 end
diff --git a/app/views/chapters/show.html.erb b/app/views/chapters/show.html.erb
index d8ab2bf48..4a3dfb514 100644
--- a/app/views/chapters/show.html.erb
+++ b/app/views/chapters/show.html.erb
@@ -26,9 +26,9 @@
     <div>
       <h3><%= t(:lessons) %></h3>
 
-      <% @chapter.lessons.each do |lesson| %>
+      <% @chapter.lessons.includes(guide: :exercises).each do |lesson| %>
         <h4><%= lesson.number %>. <%= link_to_path_element lesson, mode: :plain %></h4>
-        <%= render partial: 'layouts/progress_listing', locals: { exercises: lesson.exercises } %>
+        <%= render partial: 'layouts/progress_listing', locals: { guide: lesson.guide } %>
       <% end %>
     </div>
   <% end %>
diff --git a/app/views/exercises/show.html.erb b/app/views/exercises/show.html.erb
index 9f7cf09e6..3bb077f1c 100644
--- a/app/views/exercises/show.html.erb
+++ b/app/views/exercises/show.html.erb
@@ -30,7 +30,7 @@
 
 <div>
   <% if @stats && standalone_mode? %>
-      <%= render partial: 'layouts/progress_bar', locals: {actual: @exercise, guide: @exercise.guide, stats: @stats} %>
+      <%= render partial: 'layouts/progress_bar', locals: {current: @exercise, guide: @exercise.guide, stats: @stats} %>
   <% end %>
 </div>
 
@@ -65,6 +65,6 @@
     <%= render partial: 'layouts/modals/level_up' %>
   <% end %>
 
-  <%= render partial: 'layouts/modals/guide_corollary', locals: {guide: @guide} %>
+  <%= render partial: 'layouts/modals/guide_corollary', locals: {guide: @guide} if @stats.almost_done? %>
   <%= render partial: 'layouts/modals/new_message', locals: {exercise: @exercise} if should_render_message_input?(@exercise) %>
 <% end if current_user? %>
diff --git a/app/views/layouts/_guide.html.erb b/app/views/layouts/_guide.html.erb
index 4726ac48e..925e665e0 100644
--- a/app/views/layouts/_guide.html.erb
+++ b/app/views/layouts/_guide.html.erb
@@ -2,7 +2,7 @@
 
 <%= render partial: 'layouts/authoring', locals: {guide: @guide} %>
 
-<% if subject.timed? && subject.started?(current_user) && !current_user.teacher? %>
+<% if subject.timed? && @stats.started? && !current_user.teacher? %>
   <%= render partial: 'layouts/timer', locals: {end_time: subject.real_end_time(current_user)} %>
 <% end %>
 
@@ -10,10 +10,10 @@
 
 <h3>
   <%= t :exercises %>
-  <%= restart_guide_link(@guide) if current_user && @guide.started?(current_user) && @guide.resettable? %>
+  <%= restart_guide_link(@guide) if current_user && @stats.started? && @guide.resettable? %>
 </h3>
 
-<%= render partial: 'layouts/progress_listing', locals: {exercises: @guide.exercises} %>
+<%= render partial: 'layouts/progress_listing', locals: { guide: @guide } %>
 
 <% if @stats&.done? %>
   <div class="text-box">
diff --git a/app/views/layouts/_progress_bar.html.erb b/app/views/layouts/_progress_bar.html.erb
index 3e499cf4c..7f072d87a 100644
--- a/app/views/layouts/_progress_bar.html.erb
+++ b/app/views/layouts/_progress_bar.html.erb
@@ -1,12 +1,16 @@
 <div class="progress-list-flex">
-  <% guide.exercises.each do |e| %>
-    <a
-      <%= turbolinks_enable_for e %>
-      href="<%= exercise_path(e)%>"
-      aria-label="<%= e.navigable_name %>"
-      title="<%= e.navigable_name %>"
-      data-mu-exercise-id="<%= e.id %>"
-      class="<%= class_for_progress_list_item(e, e == actual)%>">
-    </a>
+  <% assignments = guide.assignments_for(current_user) %>
+  <% assignments.each do |assignment| %>
+    <% exercise = assignment.exercise %>
+    <% cache [:progress_list_item, exercise, assignment.status, Organization.current, exercise == current] do %>
+      <a
+        <%= turbolinks_enable_for exercise %>
+        href="<%= exercise_path(exercise)%>"
+        aria-label="<%= exercise.navigable_name %>"
+        title="<%= exercise.navigable_name %>"
+        data-mu-exercise-id="<%= exercise.id %>"
+        class="<%= class_for_progress_list_item(assignment, exercise == current)%>">
+      </a>
+    <% end %>
   <% end %>
-</div>
+</div>
\ No newline at end of file
diff --git a/app/views/layouts/_progress_listing.html.erb b/app/views/layouts/_progress_listing.html.erb
index d0bace21b..d7d32e225 100644
--- a/app/views/layouts/_progress_listing.html.erb
+++ b/app/views/layouts/_progress_listing.html.erb
@@ -1,10 +1,17 @@
 <ul class="progress-listing">
-  <% exercises.each do |exercise| %>
-      <% cache [exercise, exercise.status_for(current_user), Organization.current] do %>
-          <li <%= turbolinks_enable_for(exercise) %>>
-            <%= exercise_status_icon exercise %>
-            <%= link_to_path_element(exercise) %>
-          </li>
-      <% end %>
+  <%
+    assignments = guide.assignments_for(current_user)
+    statuses = assignments.map(&:status)
+  %>
+  <% cache_if statuses.chunk_while(&:==).count <= 2, [guide, statuses, Organization.current] do %>
+    <% assignments.each do |assignment| %>
+        <% cache [assignment.exercise, assignment.status, Organization.current] do %>
+            <li <%= turbolinks_enable_for(assignment.exercise) %>>
+              <%= assignment_status_icon assignment %>
+              <%= link_to_path_element(assignment.exercise) %>
+            </li>
+        <% end %>
+    <% end %>
   <% end %>
+
 </ul>
diff --git a/mumuki-laboratory.gemspec b/mumuki-laboratory.gemspec
index 4c7612867..82246dad7 100644
--- a/mumuki-laboratory.gemspec
+++ b/mumuki-laboratory.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency "rails", "~> 5.1.6"
 
-  s.add_dependency 'mumuki-domain', '~> 8.3.0'
+  s.add_dependency 'mumuki-domain', '~> 8.4.0'
   s.add_dependency 'mumukit-bridge', '~> 4.1'
   s.add_dependency 'mumukit-login', '~> 7.3'
   s.add_dependency 'mumukit-nuntius', '~> 6.1'
diff --git a/spec/dummy/db/schema.rb b/spec/dummy/db/schema.rb
index 40f638bb8..df36d3105 100644
--- a/spec/dummy/db/schema.rb
+++ b/spec/dummy/db/schema.rb
@@ -482,6 +482,7 @@
     t.datetime "legal_terms_accepted_at"
     t.datetime "forum_terms_accepted_at"
     t.boolean "banned_from_forum"
+    t.boolean "uppercase_mode"
     t.index ["avatar_type", "avatar_id"], name: "index_users_on_avatar_type_and_avatar_id"
     t.index ["disabled_at"], name: "index_users_on_disabled_at"
     t.index ["last_organization_id"], name: "index_users_on_last_organization_id"
diff --git a/spec/helpers/application_helper_spec.rb b/spec/helpers/application_helper_spec.rb
index c67da7a59..5411723ee 100644
--- a/spec/helpers/application_helper_spec.rb
+++ b/spec/helpers/application_helper_spec.rb
@@ -17,7 +17,6 @@
     before { reindex_current_organization! }
 
     it { expect(link_to_path_element(exercise, mode: :plain)).to eq '<a href="/exercises/30-c1-bar-foo3">foo3</a>' }
-    it { expect(link_to_path_element(exercise, mode: :friendly)).to eq '<a href="/exercises/30-c1-bar-foo3">C1: bar - foo3</a>' }
     it { expect(link_to_path_element(exercise)).to eq '<a href="/exercises/30-c1-bar-foo3">3. foo3</a>' }
   end