diff --git a/PowerDiagram.py b/PowerDiagram.py
index bccaa64..0dd959a 100644
--- a/PowerDiagram.py
+++ b/PowerDiagram.py
@@ -14,6 +14,7 @@ import re
 import sys
 import pygraphviz
 
+
 def add_capacity_constraints(capacity1, capacity2):
 	"""
 	combines 2 capacity constraints (max amperes) together
@@ -63,8 +64,8 @@ def mysql_to_sqlite( mysql_sql_code ):
 
 	def insertvals_replacer(match):
 		insert, values = match.groups()
-		#print("insert=%s"%insert)
-		#print("values=%s"%values)
+		# print("insert=%s"%insert)
+		# print("values=%s"%values)
 		values = re.sub('^\s*\(' ,'', values)
 		values = re.sub('\)\s*$' ,'', values)
 		replacement = ''
@@ -112,7 +113,7 @@ class Machine(object):
  		power_consumption = self.power_consumption
  		for conn in self.get_outgoing_connections():
  			power_consumption += conn.get_power_consumption()
-			print("machine %s : power_consumption += %f" % (self.name, conn.get_power_consumption()))
+			# print("machine %s : power_consumption += %f" % (self.name, conn.get_power_consumption()))
 		return power_consumption
 
 
@@ -242,15 +243,16 @@ class PowerConfig(object):
 				rows = cur.fetchall()
 				if len(rows) > 0:
 					plug_type = rows[0][0]
-					print('plug_type : %s' % plug_type)
+					# print('plug_type : %s' % plug_type)
 					
 					plug_capacity = get_plug_type_attr(cur, plug_type, 'max_amps')
-					if plug_capacity:
-						print('plug_capacity : %f A' % plug_capacity)
+					#if plug_capacity:
+					#	print('plug_capacity : %f A' % plug_capacity)
 			return plug_capacity
 
-	
-		sqliteDbPath='./simpa.db'
+		sqliteDbPath=':memory:'  # sqlite-specific special name for a file stored in memory. We could use something like '/tmp/simpadb.sqlite' here but this would make parsing really slow (1 minute instead of 1s), unless either :
+		# - proper fix : group of INSERT statements are surrounded by BEGIN and COMMIT (see http://stackoverflow.com/questions/4719836/python-and-sqlite3-adding-thousands-of-rows)
+		# - the file is stored on a solid state disk
 		try:
 			os.remove(sqliteDbPath)
 		except:
@@ -293,7 +295,7 @@ class PowerConfig(object):
 			if re.match('simpatix.._..', machine_name):
 				machine_name = '_'.join(machine_name.split('_')[0:-1])
 
-			print(machine_name)
+			# print(machine_name)
 
 			machine_spec_id = machine_name_toMachine_spec_id(cur, machine_name)
 			if machine_spec_id is not None:
@@ -364,7 +366,7 @@ def power_config_to_svg( power_config, svg_file_path ):
 	#graph.add_edge(u'a',u'b',color='blue')
 	#graph.add_edge(u'b',u'a',color='blue')
 	for con in power_config.connections:
-		print(con.from_plug.machine.name, con.to_plug.machine.name)
+		# print(con.from_plug.machine.name, con.to_plug.machine.name)
 		if not con.is_redundancy_cable():  # don't display redundancy cables, as they might overlap and hide the main one
 			power_consumption = con.get_power_consumption()
 			amperes = power_consumption/220.0