diff --git a/requirements-dev.txt b/requirements-dev.txt
index 83dfcbd..7ae0c91 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -5,6 +5,7 @@ coverage
 elementpath~=1.3.0
 lxml
 memory_profiler
+matplotlib
 pathlib2  # For Py27 tests on resources
 Sphinx
 sphinx_rtd_theme
diff --git a/xmlschema/tests/check_memory.py b/xmlschema/tests/check_memory.py
index 4a0c936..606c0dd 100755
--- a/xmlschema/tests/check_memory.py
+++ b/xmlschema/tests/check_memory.py
@@ -28,7 +28,7 @@ def test_choice_type(value):
 
 
 parser = argparse.ArgumentParser(add_help=True)
-parser.usage = """%(prog)s TEST_NUM [XML_FILE]
+parser.usage = """%(prog)s TEST_NUM [XML_FILE [REPEAT]]
 
 Run memory tests:
   1) Package import or schema build
@@ -44,6 +44,7 @@ Run memory tests:
 
 parser.add_argument('test_num', metavar="TEST_NUM", type=test_choice_type, help="Test number to run")
 parser.add_argument('xml_file', metavar='XML_FILE', nargs='?', help='Input XML file')
+parser.add_argument('repeat', metavar='REPEAT', nargs='?', type=int, default=1, help='Repeat operation N times')
 args = parser.parse_args()
 
 
@@ -68,54 +69,62 @@ def build_schema(source):
 
 
 @profile
-def etree_parse(source):
+def etree_parse(source, repeat=1):
     xt = ElementTree.parse(source)
-    for _ in xt.iter():
-        pass
-
-
-@profile
-def etree_full_iterparse(source):
-    context = ElementTree.iterparse(source, events=('start', 'end'))
-    for event, elem in context:
-        if event == 'start':
+    for _ in range(repeat):
+        for _ in xt.iter():
             pass
 
 
 @profile
-def etree_emptied_iterparse(source):
-    context = ElementTree.iterparse(source, events=('start', 'end'))
-    for event, elem in context:
-        if event == 'end':
-            elem.clear()
+def etree_full_iterparse(source, repeat=1):
+    for _ in range(repeat):
+        context = ElementTree.iterparse(source, events=('start', 'end'))
+        for event, elem in context:
+            if event == 'start':
+                pass
 
 
 @profile
-def decode(source):
+def etree_emptied_iterparse(source, repeat=1):
+    for _ in range(repeat):
+        context = ElementTree.iterparse(source, events=('start', 'end'))
+        for event, elem in context:
+            if event == 'end':
+                elem.clear()
+
+
+@profile
+def decode(source, repeat=1):
     decoder = xmlschema.XMLSchema.meta_schema if source.endswith('.xsd') else xmlschema
-    return decoder.to_dict(source)
+    for _ in range(repeat):
+        decoder.to_dict(source)
 
 
 @profile
-def lazy_decode(source):
+def lazy_decode(source, repeat=1):
     decoder = xmlschema.XMLSchema.meta_schema if source.endswith('.xsd') else xmlschema
-    for result in decoder.to_dict(xmlschema.XMLResource(source, lazy=True), path='*'):
-        del result
+    for _ in range(repeat):
+        for result in decoder.to_dict(xmlschema.XMLResource(source, lazy=True), path='*'):
+            del result
 
 
 @profile
-def validate(source):
+def validate(source, repeat=1):
     validator = xmlschema.XMLSchema.meta_schema if source.endswith('.xsd') else xmlschema
-    return validator.validate(source)
+    for _ in range(repeat):
+        validator.validate(source)
 
 
 @profile
-def lazy_validate(source):
+def lazy_validate(source, repeat=1):
     if source.endswith('.xsd'):
         validator, path = xmlschema.XMLSchema.meta_schema, '*'
     else:
         validator, path = xmlschema, None
-    return validator.validate(xmlschema.XMLResource(source, lazy=True), path=path)
+
+    for _ in range(repeat):
+        validator.validate(xmlschema.XMLResource(source, lazy=True), path=path)
 
 
 if __name__ == '__main__':
@@ -127,26 +136,26 @@ if __name__ == '__main__':
             build_schema(args.xml_file)
     elif args.test_num == 2:
         import xml.etree.ElementTree as ElementTree
-        etree_parse(args.xml_file)
+        etree_parse(args.xml_file, args.repeat)
     elif args.test_num == 3:
         import xml.etree.ElementTree as ElementTree
-        etree_full_iterparse(args.xml_file)
+        etree_full_iterparse(args.xml_file, args.repeat)
     elif args.test_num == 4:
         import xml.etree.ElementTree as ElementTree
-        etree_emptied_iterparse(args.xml_file)
+        etree_emptied_iterparse(args.xml_file, args.repeat)
     elif args.test_num == 5:
         import xmlschema
         xmlschema.XMLSchema.meta_schema.build()
-        decode(args.xml_file)
+        decode(args.xml_file, args.repeat)
     elif args.test_num == 6:
         import xmlschema
         xmlschema.XMLSchema.meta_schema.build()
-        lazy_decode(args.xml_file)
+        lazy_decode(args.xml_file, args.repeat)
     elif args.test_num == 7:
         import xmlschema
         xmlschema.XMLSchema.meta_schema.build()
-        validate(args.xml_file)
+        validate(args.xml_file, args.repeat)
     elif args.test_num == 8:
         import xmlschema
         xmlschema.XMLSchema.meta_schema.build()
-        lazy_validate(args.xml_file)
+        lazy_validate(args.xml_file, args.repeat)