diff --git a/pyaml/accelerator.py b/pyaml/accelerator.py
index 68bf2e9c..fd625f4a 100644
--- a/pyaml/accelerator.py
+++ b/pyaml/accelerator.py
@@ -88,5 +88,16 @@ def design(self) -> Simulator:
         return self.__design
 
     @staticmethod
-    def load(filename:str) -> "Accelerator":
-        return load_accelerator(filename)
+    def load(filename:str, use_fast_loader:bool = False) -> "Accelerator":
+        """
+        Load an accelerator from a config file.
+
+        Parameters
+        ----------
+        filename : str
+            Configuration file name, yaml or json.
+        use_fast_loader : bool
+            Use fast yaml loader. When specified, no line number are reported in case of error, 
+            only the element name that triggered the error will be reported in the exception)
+        """
+        return load_accelerator(filename,use_fast_loader)
diff --git a/pyaml/configuration/factory.py b/pyaml/configuration/factory.py
index ea517d8f..5c9ae23d 100644
--- a/pyaml/configuration/factory.py
+++ b/pyaml/configuration/factory.py
@@ -53,7 +53,7 @@ def handle_validation_error(self, e, type_str:str, location_str:str, field_locat
                 else:
                     field = err['loc'][0]
                     message = f"'{field}': {msg}"
-                if field in field_locations:
+                if field_locations and field in field_locations:
                     file, line, col = field_locations[field]
                     loc = f"{file} at line {line}, colum {col}"
                     message += f" {loc}"
diff --git a/pyaml/configuration/fileloader.py b/pyaml/configuration/fileloader.py
index 5a022e6a..5b0d92b7 100644
--- a/pyaml/configuration/fileloader.py
+++ b/pyaml/configuration/fileloader.py
@@ -8,6 +8,7 @@
 
 import yaml
 from yaml.loader import SafeLoader
+from yaml import CLoader
 from yaml.constructor import ConstructorError
 import collections.abc
 
@@ -47,26 +48,26 @@ def __init__(self, error_filename:str, path_stack:list[Path]):
         super().__init__(f"Circular file inclusion of {error_filename}. File list before reaching it: {parent_file_stack}")
     pass
 
-def load_accelerator(filename:str, paths_stack:list=None) -> "Accelerator":
-    """ Load an instrument from file."""
+def load_accelerator(filename:str, use_fast_loader:bool = False) -> "Accelerator":
+    """ Load an accelerator from file."""
 
     # Asume that all files are referenced from folder where main AML file is stored
     if not os.path.exists(filename):
        raise PyAMLException(f"{filename} file not found")
     rootfolder = os.path.abspath(os.path.dirname(filename))
     set_root_folder(rootfolder)
-    config_dict = load(os.path.basename(filename))
+    config_dict = load(os.path.basename(filename),None,use_fast_loader)
     aml = Factory.depth_first_build(config_dict)
 
     Factory.clear()
     return aml
 
-def load(filename:str, paths_stack:list=None) -> Union[dict,list]:
+def load(filename:str, paths_stack:list=None, use_fast_loader:bool = False) -> Union[dict,list]:
     """Load recursively a configuration setup"""
     if filename.endswith(".yaml") or filename.endswith(".yml"):
-        l = YAMLLoader(filename, paths_stack)
+        l = YAMLLoader(filename, paths_stack, use_fast_loader)
     elif filename.endswith(".json"):
-        l = JSONLoader(filename, paths_stack)
+        l = JSONLoader(filename, paths_stack, use_fast_loader)
     else:
         raise PyAMLException(f"{filename} File format not supported (only .yaml .yml or .json)")
     return l.load()
@@ -94,7 +95,7 @@ def expand_dict(self,d:dict):
         for key, value in d.items():
             try:
                 if hasToExpand(value):
-                    d[key] = load(value, self.files_stack)
+                    d[key] = load(value, self.files_stack, self.use_fast_loader)
                 else:
                     self.expand(value)
             except PyAMLConfigCyclingException as pyaml_ex:
@@ -155,21 +156,24 @@ def construct_mapping(self, node, deep=False):
 
 # YAML loader
 class YAMLLoader(Loader):
-    def __init__(self, filename: str, parent_paths_stack:list):
+    def __init__(self, filename: str, parent_paths_stack:list,use_fast_loader:bool):
         super().__init__(filename, parent_paths_stack)
+        self._loader = SafeLineLoader if not use_fast_loader else CLoader
+        self.use_fast_loader = use_fast_loader
 
     def load(self) -> Union[dict,list]:
         logger.log(logging.DEBUG, f"Loading YAML file '{self.path}'")
         with open(self.path) as file:
             try:
-                return self.expand(yaml.load(file,Loader=SafeLineLoader))
+                return self.expand(yaml.load(file,Loader=self._loader))
             except yaml.YAMLError as e:
                 raise PyAMLException(str(self.path) + ": " + str(e)) from e
 
 # JSON loader
 class JSONLoader(Loader):
-    def __init__(self, filename: str, parent_paths_stack:list):
+    def __init__(self, filename: str, parent_paths_stack:list,use_fast_loader:bool):
         super().__init__(filename, parent_paths_stack)
+        self.use_fast_loader = False
 
     def  load(self) -> Union[dict,list]:
         logger.log(logging.DEBUG, f"Loading JSON file '{self.path}'")
diff --git a/tests/test_arrays.py b/tests/test_arrays.py
index 5b16681f..79ed6e56 100644
--- a/tests/test_arrays.py
+++ b/tests/test_arrays.py
@@ -174,7 +174,7 @@ def test_arrays(install_test_package):
 
     # Test dynamic arrays
 
-    sr:Accelerator = Accelerator.load("tests/config/EBSOrbit.yaml")
+    sr:Accelerator = Accelerator.load("tests/config/EBSOrbit.yaml",use_fast_loader=True)
     ae = ElementArray("All",sr.design.get_all_elements())
     acfm = ElementArray("AllCFM",sr.design.get_all_cfm_magnets(),use_aggregator=False)