diff --git a/server/NeonSprawl.Server/CatalogSchemaRegistry.cs b/server/NeonSprawl.Server/CatalogSchemaRegistry.cs
new file mode 100644
index 0000000..aa1d287
--- /dev/null
+++ b/server/NeonSprawl.Server/CatalogSchemaRegistry.cs
@@ -0,0 +1,34 @@
+using System.Collections.Concurrent;
+using Json.Schema;
+
+namespace NeonSprawl.Server;
+
+/// <summary>
+/// Thread-safe registration for <see cref="SchemaRegistry.Global"/> (JsonSchema.Net registry is not concurrent).
+/// Used by content catalog loaders when parallel integration tests spin up multiple hosts.
+/// </summary>
+internal static class CatalogSchemaRegistry
+{
+    private static readonly Lock RegisterLock = new();
+    private static readonly ConcurrentDictionary<string, JsonSchema> SchemasByPath =
+        new(StringComparer.Ordinal);
+
+    /// <summary>Parses <paramref name="schemaFilePath"/> once per process and registers it under a global lock.</summary>
+    public static JsonSchema GetOrRegisterFromFile(string schemaFilePath)
+    {
+        var fullPath = Path.GetFullPath(schemaFilePath);
+        if (SchemasByPath.TryGetValue(fullPath, out var cached))
+            return cached;
+
+        lock (RegisterLock)
+        {
+            if (SchemasByPath.TryGetValue(fullPath, out cached))
+                return cached;
+
+            var schema = JsonSchema.FromText(File.ReadAllText(fullPath));
+            SchemaRegistry.Global.Register(schema);
+            SchemasByPath[fullPath] = schema;
+            return schema;
+        }
+    }
+}
diff --git a/server/NeonSprawl.Server/Game/Crafting/RecipeDefinitionCatalogLoader.cs b/server/NeonSprawl.Server/Game/Crafting/RecipeDefinitionCatalogLoader.cs
index b3a5c78..f43a8f4 100644
--- a/server/NeonSprawl.Server/Game/Crafting/RecipeDefinitionCatalogLoader.cs
+++ b/server/NeonSprawl.Server/Game/Crafting/RecipeDefinitionCatalogLoader.cs
@@ -45,12 +45,8 @@ public static class RecipeDefinitionCatalogLoader
         if (errors.Count > 0)
             ThrowIfAny(errors);
 
-        var ioSchemaText = File.ReadAllText(recipeIoRowSchemaPath);
-        var defSchemaText = File.ReadAllText(recipeDefSchemaPath);
-        var ioSchema = JsonSchema.FromText(ioSchemaText);
-        SchemaRegistry.Global.Register(ioSchema);
-        var defSchema = JsonSchema.FromText(defSchemaText);
-        SchemaRegistry.Global.Register(defSchema);
+        var ioSchema = CatalogSchemaRegistry.GetOrRegisterFromFile(recipeIoRowSchemaPath);
+        var defSchema = CatalogSchemaRegistry.GetOrRegisterFromFile(recipeDefSchemaPath);
 
         var evalOptions = new EvaluationOptions { OutputFormat = OutputFormat.List };
 
diff --git a/server/NeonSprawl.Server/Game/Encounters/RewardTableDefinitionCatalogLoader.cs b/server/NeonSprawl.Server/Game/Encounters/RewardTableDefinitionCatalogLoader.cs
index 7a3b464..b510ede 100644
--- a/server/NeonSprawl.Server/Game/Encounters/RewardTableDefinitionCatalogLoader.cs
+++ b/server/NeonSprawl.Server/Game/Encounters/RewardTableDefinitionCatalogLoader.cs
@@ -44,10 +44,8 @@ public static class RewardTableDefinitionCatalogLoader
         if (errors.Count > 0)
             ThrowIfAny(errors);
 
-        var grantRowSchema = JsonSchema.FromText(File.ReadAllText(rewardGrantRowSchemaPath));
-        SchemaRegistry.Global.Register(grantRowSchema);
-        var tableSchema = JsonSchema.FromText(File.ReadAllText(rewardTableSchemaPath));
-        SchemaRegistry.Global.Register(tableSchema);
+        var grantRowSchema = CatalogSchemaRegistry.GetOrRegisterFromFile(rewardGrantRowSchemaPath);
+        var tableSchema = CatalogSchemaRegistry.GetOrRegisterFromFile(rewardTableSchemaPath);
 
         var evalOptions = new EvaluationOptions { OutputFormat = OutputFormat.List };
 
diff --git a/server/NeonSprawl.Server/Game/Quests/QuestDefinitionCatalogLoader.cs b/server/NeonSprawl.Server/Game/Quests/QuestDefinitionCatalogLoader.cs
index 7d099f0..f570220 100644
--- a/server/NeonSprawl.Server/Game/Quests/QuestDefinitionCatalogLoader.cs
+++ b/server/NeonSprawl.Server/Game/Quests/QuestDefinitionCatalogLoader.cs
@@ -9,7 +9,6 @@ namespace NeonSprawl.Server.Game.Quests;
 /// <summary>Loads and validates <c>content/quests/*_quests.json</c> using the same rules as <c>scripts/validate_content.py</c> (NEO-113).</summary>
 public static class QuestDefinitionCatalogLoader
 {
-    private static readonly Lock SchemaLoadLock = new();
     private static JsonSchema? _questObjectiveDefSchema;
     private static JsonSchema? _questStepDefSchema;
     private static JsonSchema? _questDefSchema;
@@ -352,23 +351,12 @@ public static class QuestDefinitionCatalogLoader
         string questStepDefSchemaPath,
         string questDefSchemaPath)
     {
-        lock (SchemaLoadLock)
-        {
-            if (_questDefSchema is not null)
-                return;
+        if (_questDefSchema is not null)
+            return;
 
-            var objectiveSchema = JsonSchema.FromText(File.ReadAllText(questObjectiveDefSchemaPath));
-            SchemaRegistry.Global.Register(objectiveSchema);
-            _questObjectiveDefSchema = objectiveSchema;
-
-            var stepSchema = JsonSchema.FromText(File.ReadAllText(questStepDefSchemaPath));
-            SchemaRegistry.Global.Register(stepSchema);
-            _questStepDefSchema = stepSchema;
-
-            var defSchema = JsonSchema.FromText(File.ReadAllText(questDefSchemaPath));
-            SchemaRegistry.Global.Register(defSchema);
-            _questDefSchema = defSchema;
-        }
+        _questObjectiveDefSchema = CatalogSchemaRegistry.GetOrRegisterFromFile(questObjectiveDefSchemaPath);
+        _questStepDefSchema = CatalogSchemaRegistry.GetOrRegisterFromFile(questStepDefSchemaPath);
+        _questDefSchema = CatalogSchemaRegistry.GetOrRegisterFromFile(questDefSchemaPath);
     }
 
     private static void ThrowIfAny(List<string> errors)