Index: leahi_dialin/dd/modules/spent_chamber_fill.py
===================================================================
diff -u -re45b20cdc5d4c5dcff8cef530b173ca94cb2e422 -r820c94585ab5d85c40395e828c4dfe2da164c105
--- leahi_dialin/dd/modules/spent_chamber_fill.py	(.../spent_chamber_fill.py)	(revision e45b20cdc5d4c5dcff8cef530b173ca94cb2e422)
+++ leahi_dialin/dd/modules/spent_chamber_fill.py	(.../spent_chamber_fill.py)	(revision 820c94585ab5d85c40395e828c4dfe2da164c105)
@@ -16,6 +16,7 @@
 
 # Module imports
 from logging import Logger
+import time
 
 # Project imports
 from leahi_dialin.common.constants import NO_RESET
@@ -52,6 +53,7 @@
         self.execution_state = 0                                #: The execution state
         self.switching_period = 0                               #: The switching period
         self.total_spent_chamber_fill_counter = 0               #: The total spent chamber fill counter
+        self.handler_execution_times = []
 
 
     @publish(["msg_id_dd_spent_chamber_fill_data",
@@ -65,6 +67,7 @@
         @param message:  published spent chamber fill data message
         @return: None
         """
+        start = time.perf_counter()
         msg_list =[]
         msg_list.append(('self.execution_state',                    DataTypes.U32))
         msg_list.append(('self.switching_period',                   DataTypes.U32))
@@ -73,6 +76,7 @@
         self.process_into_vars(decoder_list = msg_list,
                                message = message)
         self.dd_spent_chamber_timestamp = timestamp
+        self.handler_execution_times.append(time.perf_counter() - start)
 
 
     def cmd_spent_chamber_fill_broadcast_interval_override(self, ms: int, reset: int = NO_RESET) -> int: