diff --git a/Source/Engine/Engine/NativeInterop.Unmanaged.cs b/Source/Engine/Engine/NativeInterop.Unmanaged.cs
index 7af32fc9b..33e102089 100644
--- a/Source/Engine/Engine/NativeInterop.Unmanaged.cs
+++ b/Source/Engine/Engine/NativeInterop.Unmanaged.cs
@@ -1197,11 +1197,17 @@ namespace FlaxEngine.Interop
         }
 
         [UnmanagedCallersOnly]
-        internal static byte GetMethodParameterIsOut(ManagedHandle methodHandle, int parameterNum)
+        internal static UInt64 GetMethodParameterIsOut(ManagedHandle methodHandle)
         {
             MethodHolder methodHolder = Unsafe.As<MethodHolder>(methodHandle.Target);
-            ParameterInfo parameterInfo = methodHolder.method.GetParameters()[parameterNum];
-            return (byte)(parameterInfo.IsOut ? 1 : 0);
+            var parameters = methodHolder.method.GetParameters();
+            UInt64 result = 0;
+            for (int i = 0; i < parameters.Length; i++)
+            {
+                if (parameters[i].IsOut)
+                    result |= 1ul << i;
+            }
+            return result;
         }
 
         [UnmanagedCallersOnly]
diff --git a/Source/Engine/Scripting/ManagedCLR/MMethod.h b/Source/Engine/Scripting/ManagedCLR/MMethod.h
index 51264d1b8..f6e6b37e2 100644
--- a/Source/Engine/Scripting/ManagedCLR/MMethod.h
+++ b/Source/Engine/Scripting/ManagedCLR/MMethod.h
@@ -29,6 +29,7 @@ protected:
     int32 _paramsCount;
     mutable void* _returnType;
     mutable Array<void*, InlinedAllocation<8>> _parameterTypes;
+    mutable uint64 _parameterOuts = 0;
     void CacheSignature() const;
 #else
     StringAnsiView _name;
diff --git a/Source/Engine/Scripting/Runtime/DotNet.cpp b/Source/Engine/Scripting/Runtime/DotNet.cpp
index 21d63e9d6..65dd09b44 100644
--- a/Source/Engine/Scripting/Runtime/DotNet.cpp
+++ b/Source/Engine/Scripting/Runtime/DotNet.cpp
@@ -1514,13 +1514,16 @@ void MMethod::CacheSignature() const
 
     static void* GetMethodReturnTypePtr = GetStaticMethodPointer(TEXT("GetMethodReturnType"));
     static void* GetMethodParameterTypesPtr = GetStaticMethodPointer(TEXT("GetMethodParameterTypes"));
+    static void* GetMethodParameterIsOutPtr = GetStaticMethodPointer(TEXT("GetMethodParameterIsOut"));
     _returnType = CallStaticMethod<void*, void*>(GetMethodReturnTypePtr, _handle);
+    _parameterOuts = 0;
     if (_paramsCount != 0)
     {
         void** parameterTypeHandles;
         CallStaticMethod<void, void*, void***>(GetMethodParameterTypesPtr, _handle, &parameterTypeHandles);
         _parameterTypes.Set(parameterTypeHandles, _paramsCount);
         MCore::GC::FreeMemory(parameterTypeHandles);
+        _parameterOuts = CallStaticMethod<uint64, void*>(GetMethodParameterIsOutPtr, _handle);
     }
 
     _hasCachedSignature = true;
@@ -1587,9 +1590,7 @@ bool MMethod::GetParameterIsOut(int32 paramIdx) const
     if (!_hasCachedSignature)
         CacheSignature();
     ASSERT_LOW_LAYER(paramIdx >= 0 && paramIdx < _paramsCount);
-    // TODO: cache GetParameterIsOut maybe?
-    static void* GetMethodParameterIsOutPtr = GetStaticMethodPointer(TEXT("GetMethodParameterIsOut"));
-    return CallStaticMethod<bool, void*, int>(GetMethodParameterIsOutPtr, _handle, paramIdx);
+    return _parameterOuts & (1ull << paramIdx);
 }
 
 bool MMethod::HasAttribute(const MClass* klass) const