private static Dictionary<string, GetHandler> GetHandlerCache = new Dictionary<string, GetHandler>();
private static Dictionary<string, SetHandler> SetHandlerCache = new Dictionary<string, SetHandler>();
private static Dictionary<string, InstantiateObjectHandler> InstantiateObjectHandlerCache = new Dictionary<string, InstantiateObjectHandler>();

....
        public static GetHandler CreateGetHandler(Type type, FieldInfo fieldInfo)
        {
            string FieldFullName = type.FullName + "." + fieldInfo.Name;
            if (!GetHandlerCache.ContainsKey(FieldFullName))
            {
                DynamicMethod dynamicGet = CreateGetDynamicMethod(type);
                ILGenerator getGenerator = dynamicGet.GetILGenerator();

                getGenerator.Emit(OpCodes.Ldarg_0);
                getGenerator.Emit(OpCodes.Ldfld, fieldInfo);
                BoxIfNeeded(fieldInfo.FieldType, getGenerator);
                getGenerator.Emit(OpCodes.Ret);
                GetHandler handler = (GetHandler)dynamicGet.CreateDelegate(typeof(GetHandler));
                GetHandlerCache.Add(FieldFullName, handler);
            }
            return GetHandlerCache[FieldFullName];
        }