diff --git a/.rubocop.yml b/.rubocop.yml
index 54684b10..43ceff52 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -4,6 +4,7 @@ inherit_from: .rubocop_todo.yml
 require:
   - rubocop-rails
   - rubocop-capybara
+  - rubocop-performance
 
 AllCops:
   TargetRubyVersion: 3.2
diff --git a/Gemfile b/Gemfile
index a170ffe6..5c032038 100644
--- a/Gemfile
+++ b/Gemfile
@@ -67,6 +67,7 @@ group :linter do
   gem 'rubocop-rails', '~> 2.21.1'
   gem 'rubocop-rake', '~> 0.6.0'
   gem 'rubocop-capybara', '~> 2.19.0'
+  gem 'rubocop-performance', '~> 1.19.0'
 end
 
 group :release do
diff --git a/Gemfile.lock b/Gemfile.lock
index 8f9e24ba..b64fd160 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -355,6 +355,9 @@ GEM
       parser (>= 3.2.1.0)
     rubocop-capybara (2.19.0)
       rubocop (~> 1.41)
+    rubocop-performance (1.19.1)
+      rubocop (>= 1.7.0, < 2.0)
+      rubocop-ast (>= 0.4.0)
     rubocop-rails (2.21.1)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
@@ -481,6 +484,7 @@ DEPENDENCIES
   rspec-openapi
   rubocop (~> 1.56.3)
   rubocop-capybara (~> 2.19.0)
+  rubocop-performance (~> 1.19.0)
   rubocop-rails (~> 2.21.1)
   rubocop-rake (~> 0.6.0)
   ruby-saml
diff --git a/app/models/hiera_data.rb b/app/models/hiera_data.rb
index e7658476..82e255ea 100644
--- a/app/models/hiera_data.rb
+++ b/app/models/hiera_data.rb
@@ -69,7 +69,7 @@ def search_key(hierarchy_name, key, facts: nil)
       search_results[path] = {
         file_present: file.exist?,
         file_writable: file.writable?,
-        key_present: file.keys.include?(key),
+        key_present: file.keys.include?(key), # rubocop:disable Performance/InefficientHashSearch
         replaced_from_git: file.replaced_from_git?,
         value: file.content_for_key(key)
       }
diff --git a/app/models/hiera_data/hierarchy.rb b/app/models/hiera_data/hierarchy.rb
index 004a8e03..d532dc20 100644
--- a/app/models/hiera_data/hierarchy.rb
+++ b/app/models/hiera_data/hierarchy.rb
@@ -23,7 +23,7 @@ def name
     end
 
     def lookup_function
-      @lookup_function ||= LOOKUP_FUNCTIONS.find { |f| raw_hash.keys.include?(f) }
+      @lookup_function ||= LOOKUP_FUNCTIONS.find { |f| raw_hash.keys.include?(f) } # rubocop:disable Performance/InefficientHashSearch
     end
 
     def backend