diff --git a/src/canmatrix/canmatrix.py b/src/canmatrix/canmatrix.py
index f88f5a53..b1c50759 100644
--- a/src/canmatrix/canmatrix.py
+++ b/src/canmatrix/canmatrix.py
@@ -191,7 +191,7 @@ class Signal(object):
 
     cycle_time = attr.ib(default=0)  # type: int
     initial_value = attr.ib(converter=float_factory, default=float_factory(0.0))  # type: canmatrix.types.PhysicalValue
-
+    scale_ranges = attr.ib(factory=list)
     min = attr.ib(
         converter=lambda value, float_factory=float_factory: (
             float_factory(value)
@@ -1793,7 +1793,7 @@ class CanMatrix(object):
 
     frames_dict_name = attr.ib(factory=dict)  # type: typing.MutableSequence[Frame]
     frames_dict_id = attr.ib(factory=dict)  # type: typing.MutableSequence[Frame]
-
+    _frames_dict_id_extend = {}
     signal_defines = attr.ib(factory=dict)  # type: typing.MutableMapping[str, Define]
     frame_defines = attr.ib(factory=dict)  # type: typing.MutableMapping[str, Define]
     global_defines = attr.ib(factory=dict)  # type: typing.MutableMapping[str, Define]
@@ -1985,10 +1985,16 @@ def frame_by_id(self, arbitration_id):  # type: (ArbitrationId) -> typing.Union[
         :param ArbitrationId arbitration_id: Frame id as canmatrix.ArbitrationId
         :rtype: Frame or None
         """
-        for test in self.frames:
-            if test.arbitration_id == arbitration_id:
+        hash_name = f"{arbitration_id.id}_{arbitration_id.extended}"
+        
+        frame = self._frames_dict_id_extend.get(hash_name, None)
+        if frame is not None:
+            return frame
+        for frame in self.frames:
+            if frame.arbitration_id == arbitration_id:
                 # found ID while ignoring extended or standard
-                return test
+                self._frames_dict_id_extend[hash_name] = frame
+                return frame
         return None
 
     def frame_by_header_id(self, header_id):  # type: (HeaderId) -> typing.Union[Frame, None]
@@ -2090,7 +2096,7 @@ def add_frame(self, frame):  # type: (Frame) -> Frame
         :return: the inserted Frame
         """
         self.frames.append(frame)
-
+        self._frames_dict_id_extend = {}
         self.frames_dict_name[frame.name] = frame
         if frame.header_id:
             self.frames_dict_id[frame.header_id] = frame
@@ -2105,6 +2111,7 @@ def remove_frame(self, frame):  # type: (Frame) -> None
         :param Frame frame: frame to remove from CAN Matrix
         """
         self.frames.remove(frame)
+        self._frames_dict_id_extend = {}
 
     def add_signal(self, signal):  # type: (Signal) -> Signal
         """
@@ -2199,6 +2206,8 @@ def add_ecu(self, ecu):  # type(Ecu) -> None  # todo return Ecu?
             if bu.name.strip() == ecu.name:
                 return
         self.ecus.append(ecu)
+        self._frames_dict_id_extend = {}
+
 
     def del_ecu(self, ecu_or_glob):  # type: (typing.Union[Ecu, str]) -> None
         """Remove ECU from Matrix and all Frames.
@@ -2369,6 +2378,7 @@ def merge(self, mergeArray):  # type: (typing.Sequence[CanMatrix]) -> None
                 else:
                     logger.error(
                         "Name Conflict, could not copy/merge EnvVar " + envVar)
+        self._frames_dict_id_extend = {}
 
     def set_fd_type(self) -> None:
         """Try to guess and set the CAN type for every frame.
diff --git a/src/canmatrix/formats/arxml.py b/src/canmatrix/formats/arxml.py
index bff1970e..717c907a 100644
--- a/src/canmatrix/formats/arxml.py
+++ b/src/canmatrix/formats/arxml.py
@@ -1960,18 +1960,20 @@ def decode_ethernet_helper(ea, float_factory):
                             try:
                                 target_frame.header_id = int(pdu_triggering_header_id_map[ipdu_triggering], 0)
                             except:
-                                target_frame.header_id = 0
-                        #                    continue
-                        
+                                pass
+
+                        # In Case Neither transmitter Nor receiver
                         if comm_direction.text == "OUT":
                             target_frame.add_transmitter(ecu.name)
-                        else:
+                        elif comm_direction.text == "IN":
                             target_frame.add_receiver(ecu.name)
+                        else:
+                            pass
                         
                         pdu_sig_mapping = ea.findall("I-SIGNAL-TO-I-PDU-MAPPING", ipdu)
 
                         get_signals(pdu_sig_mapping, target_frame, ea, None, float_factory)
-                        target_frame.update_receiver()
+                        # target_frame.update_receiver() # It will make transmitter and receiver worse
                         db.add_frame(target_frame)
                         
     return found_matrixes
@@ -2089,10 +2091,14 @@ def decode_can_helper(ea, float_factory, ignore_cluster_info):
                         else:
                             ecu = process_ecu(ecu_elem, ea)
                             nodes[ecu_elem] = ecu
+
+                        # In Case Neither transmitter Nor receiver
                         if comm_direction.text == "OUT":
                             frame.add_transmitter(ecu.name)
-                        else:
+                        elif comm_direction.text == "IN":
                             frame.add_receiver(ecu.name)
+                        else:
+                            pass
                         db.add_ecu(ecu)
                 db.add_frame(frame)
         for frame in db.frames:
diff --git a/src/canmatrix/formats/ldf.py b/src/canmatrix/formats/ldf.py
index 51de6da8..7b4ba715 100644
--- a/src/canmatrix/formats/ldf.py
+++ b/src/canmatrix/formats/ldf.py
@@ -25,6 +25,12 @@ def load(f, **options):  # type: (typing.IO, **typing.Any) -> canmatrix.CanMatri
                     if isinstance(converter, ldfparser.encoding.LogicalValue):
                         cm_signal.add_values(converter.phy_value, converter.info)
                     if isinstance(converter, ldfparser.encoding.PhysicalValue):
+                        cm_signal.scale_ranges.append({
+                            "min" : converter.phy_min, 
+                            "max" : converter.phy_max,
+                            "factor" : converter.scale,
+                            "offset" : converter.offset,
+                            "unit" : converter.unit})
                         cm_signal.offset = converter.offset
                         cm_signal.factor = converter.scale
                         cm_signal.unit = converter.unit
diff --git a/src/canmatrix/formats/xls.py b/src/canmatrix/formats/xls.py
index b25bb280..b7d2a77c 100644
--- a/src/canmatrix/formats/xls.py
+++ b/src/canmatrix/formats/xls.py
@@ -545,7 +545,9 @@ def load(file, **options):
                 unit = unit.strip()
                 new_signal.unit = unit
                 try:
-                    new_signal.factor = float_factory(factor)
+                    # if prevents overwriting explicit factor (if given)
+                    if new_signal.factor in (1, 1.0):	
+                        new_signal.factor = float_factory(factor)
                 except:
                     logger.warning(
                         "Some error occurred while decoding scale of Signal %s: '%s'",