diff --git a/test/support/fixtures/music_brainz/release.ex b/test/support/fixtures/music_brainz/release.ex
index dccdc6bb..00019806 100644
--- a/test/support/fixtures/music_brainz/release.ex
+++ b/test/support/fixtures/music_brainz/release.ex
@@ -1,35 +1,43 @@
 defmodule MusicBrainz.Fixtures.Release do
   @fixtures_folder Path.join([File.cwd!(), "test/support/fixtures/music_brainz"])
 
-  def releases(:queen_greatest_hits) do
-    Path.join([@fixtures_folder, "releases - queen - greatest hits.json"])
-    |> File.read!()
-    |> JSON.decode!()
-  end
+  # Cache JSON fixtures at compile time to avoid repeated file I/O
+  @releases_queen_greatest_hits Path.join([
+                                  @fixtures_folder,
+                                  "releases - queen - greatest hits.json"
+                                ])
+                                |> File.read!()
+                                |> JSON.decode!()
 
-  def releases(:marbles) do
-    Path.join([@fixtures_folder, "releases - marillion - marbles.json"])
-    |> File.read!()
-    |> JSON.decode!()
-  end
+  @releases_marbles Path.join([@fixtures_folder, "releases - marillion - marbles.json"])
+                    |> File.read!()
+                    |> JSON.decode!()
 
-  def release(:mystery_of_time) do
-    Path.join([@fixtures_folder, "release - avantasia - the mystery of time.json"])
-    |> File.read!()
-    |> JSON.decode!()
-  end
+  @release_mystery_of_time Path.join([
+                             @fixtures_folder,
+                             "release - avantasia - the mystery of time.json"
+                           ])
+                           |> File.read!()
+                           |> JSON.decode!()
 
-  def release(:marbles) do
-    Path.join([@fixtures_folder, "release - marillion - marbles.json"])
-    |> File.read!()
-    |> JSON.decode!()
-  end
+  @release_marbles Path.join([@fixtures_folder, "release - marillion - marbles.json"])
+                   |> File.read!()
+                   |> JSON.decode!()
 
-  def release_with_media(:marbles) do
-    Path.join([@fixtures_folder, "release_with_media - marillion - marbles.json"])
-    |> File.read!()
-    |> JSON.decode!()
-  end
+  @release_with_media_marbles Path.join([
+                                @fixtures_folder,
+                                "release_with_media - marillion - marbles.json"
+                              ])
+                              |> File.read!()
+                              |> JSON.decode!()
+
+  def releases(:queen_greatest_hits), do: @releases_queen_greatest_hits
+  def releases(:marbles), do: @releases_marbles
+
+  def release(:mystery_of_time), do: @release_mystery_of_time
+  def release(:marbles), do: @release_marbles
+
+  def release_with_media(:marbles), do: @release_with_media_marbles
 
   def release_id(name) do
     release(name) |> Map.get("id")
diff --git a/test/support/fixtures/music_brainz/release_group.ex b/test/support/fixtures/music_brainz/release_group.ex
index b341deb9..e287ff5d 100644
--- a/test/support/fixtures/music_brainz/release_group.ex
+++ b/test/support/fixtures/music_brainz/release_group.ex
@@ -1,32 +1,37 @@
 defmodule MusicBrainz.Fixtures.ReleaseGroup do
   @fixtures_folder Path.join([File.cwd!(), "test/support/fixtures/music_brainz"])
 
-  def release_group_search_results do
-    Path.join([@fixtures_folder, "release_group_search_results - marillion - marbles.json"])
-    |> File.read!()
-    |> JSON.decode!()
-  end
+  # Cache JSON fixtures at compile time to avoid repeated file I/O
+  @release_group_search_results Path.join([
+                                  @fixtures_folder,
+                                  "release_group_search_results - marillion - marbles.json"
+                                ])
+                                |> File.read!()
+                                |> JSON.decode!()
 
-  def release_group(:mystery_of_time) do
-    Path.join([@fixtures_folder, "release_group - avantasia - the mystery of time.json"])
-    |> File.read!()
-    |> JSON.decode!()
-  end
+  @mystery_of_time Path.join([
+                     @fixtures_folder,
+                     "release_group - avantasia - the mystery of time.json"
+                   ])
+                   |> File.read!()
+                   |> JSON.decode!()
 
-  def release_group(:marbles) do
-    Path.join([@fixtures_folder, "release_group - marillion - marbles.json"])
-    |> File.read!()
-    |> JSON.decode!()
-  end
+  @marbles Path.join([@fixtures_folder, "release_group - marillion - marbles.json"])
+           |> File.read!()
+           |> JSON.decode!()
 
-  def release_group(:lockdown_trilogy) do
-    Path.join([
-      @fixtures_folder,
-      "release_group_with_includes - mariusz duda - lockdown trilogy.json"
-    ])
-    |> File.read!()
-    |> JSON.decode!()
-  end
+  @lockdown_trilogy Path.join([
+                      @fixtures_folder,
+                      "release_group_with_includes - mariusz duda - lockdown trilogy.json"
+                    ])
+                    |> File.read!()
+                    |> JSON.decode!()
+
+  def release_group_search_results, do: @release_group_search_results
+
+  def release_group(:mystery_of_time), do: @mystery_of_time
+  def release_group(:marbles), do: @marbles
+  def release_group(:lockdown_trilogy), do: @lockdown_trilogy
 
   def release_group_releases(name) do
     rg = release_group(name)