example fsSerializer.cs
// suggest Dictionary.TryGetValue

private static bool IsObjectReference(fsData data) {
if (data.IsDictionary == false) return false;
return data.AsDictionary.ContainsKey(Key_ObjectReference); /// <— first access
}

private fsResult InternalDeserialize_1_CycleReference(Type overrideConverterType, fsData data, Type storageType, ref object result, out List<fsObjectProcessor> processors) {
if (IsObjectReference(data)) {
int refId = int.Parse(data.AsDictionary[Key_ObjectReference].AsString); /// <— second access
result = _references.GetReferenceObject(refId);
processors = GetProcessors(result.GetType());
return fsResult.Success;
}

return InternalDeserialize_3_Inheritance(overrideConverterType, data, storageType, ref result, out processors);
}

and MessageRouter.cs
listeners[message] /// many access