diff --git a/lib/proposals_discussion_plugin/api.rb b/lib/proposals_discussion_plugin/api.rb
index aabb556..476b728 100644
--- a/lib/proposals_discussion_plugin/api.rb
+++ b/lib/proposals_discussion_plugin/api.rb
@@ -4,15 +4,16 @@ class ProposalsDiscussionPlugin::API < Grape::API
 
     get ':id/ranking' do
       article = find_article(environment.articles, params[:id])
-      proposals = article.proposals.map do |proposal|
-        effective_support = (proposal.votes_for - proposal.votes_against)/proposal.hits.to_f
-        effective_participation = (proposal.votes_for + proposal.votes_against)/proposal.hits.to_f
+      Rails.cache.fetch("#{article.cache_key}/proposals_ranking", expires_in: 1.hours) do
+        proposals = article.proposals.map do |proposal|
+          effective_support = (proposal.votes_for - proposal.votes_against)/proposal.hits.to_f
+          effective_participation = (proposal.votes_for + proposal.votes_against)/proposal.hits.to_f
 
-        {:id => proposal.id, :abstract => proposal.abstract, :votes_for => proposal.votes_for, :votes_against => proposal.votes_against, :hits => proposal.hits, :effective_support => effective_support, :effective_participation => effective_participation}
+          {:id => proposal.id, :abstract => proposal.abstract, :votes_for => proposal.votes_for, :votes_against => proposal.votes_against, :hits => proposal.hits, :effective_support => effective_support, :effective_participation => effective_participation}
+        end
+        proposals = proposals.sort_by { |p| p[:effective_support] }.reverse
+        {:proposals => proposals, :updated_at => DateTime.now}
       end
-
-      proposals = proposals.sort_by { |p| p[:effective_support] }.reverse
-      {:proposals => proposals, :updated_at => DateTime.now}
     end
 
   end
--
libgit2 0.21.2