diff --git a/src/cpl_query/base/sequence_values.py b/src/cpl_query/base/sequence_values.py
index e5406412..9e2a485e 100644
--- a/src/cpl_query/base/sequence_values.py
+++ b/src/cpl_query/base/sequence_values.py
@@ -19,12 +19,14 @@ class SequenceValues:
         if not hasattr(data, '__iter__'):
             raise TypeError(f'{type(self).__name__} must be instantiated with an iterable object')
 
-        self._data = data
+        self._new_cycle = lambda: itertools.cycle(data)
+        self._len = lambda: len(data)
+
         self._index = 0
-        self._cycle = itertools.cycle(self._data)
+        self._cycle = self._new_cycle()
 
     def __len__(self):
-        return sum(1 for item in self._data)
+        return self._len()
 
     def __iter__(self):
         i = 0
@@ -44,4 +46,4 @@ class SequenceValues:
 
     def reset(self):
         self._index = 0
-        self._cycle = itertools.cycle(self._data)
+        self._cycle = self._new_cycle()
diff --git a/src/cpl_query/enumerable/enumerable.py b/src/cpl_query/enumerable/enumerable.py
index 6291cd5d..d095f473 100644
--- a/src/cpl_query/enumerable/enumerable.py
+++ b/src/cpl_query/enumerable/enumerable.py
@@ -233,9 +233,9 @@ class Enumerable(EnumerableABC):
         if self is None:
             raise ArgumentNoneException(ExceptionArgument.list)
 
-        if self.count() > 1:
+        if len(self) > 1:
             raise IndexError('Found more than one element')
-        elif self.count() == 0:
+        elif len(self) == 0:
             return None
 
         return self.element_at(0)
@@ -316,4 +316,4 @@ class Enumerable(EnumerableABC):
         if _func is None:
             raise ArgumentNoneException(ExceptionArgument.func)
 
-        return Enumerable(self.type, [x for x in self if _func(x)])
+        return Enumerable(self.type, list(filter(_func, self._values)))
diff --git a/src/cpl_query/iterable/iterable.py b/src/cpl_query/iterable/iterable.py
index 154630cf..64a0ce31 100644
--- a/src/cpl_query/iterable/iterable.py
+++ b/src/cpl_query/iterable/iterable.py
@@ -340,4 +340,4 @@ class Iterable(IterableABC):
             if _func(element):
                 result.append(element)
 
-        return result
+        return result
\ No newline at end of file
diff --git a/unittests/unittests_query/performance_test_case.py b/unittests/unittests_query/performance_test_case.py
index 9a375763..1741f4e2 100644
--- a/unittests/unittests_query/performance_test_case.py
+++ b/unittests/unittests_query/performance_test_case.py
@@ -5,7 +5,7 @@ import unittest
 from cpl_query.enumerable import Enumerable
 from cpl_query.iterable import Iterable
 
-VALUES = 1000
+VALUES = 10000
 COUNT = 50
 
 
@@ -23,6 +23,7 @@ class PerformanceTestCase(unittest.TestCase):
         enumerable = timeit.timeit(lambda: Enumerable(int, self.values), number=COUNT)
         iterable = timeit.timeit(lambda: Iterable(int, self.values), number=COUNT)
 
+        print('Range')
         print(f'd: {default}')
         print(f'i: {iterable}')
         print(f'e: {enumerable}')
@@ -35,6 +36,7 @@ class PerformanceTestCase(unittest.TestCase):
         iterable = timeit.timeit(lambda: Iterable(int, self.values).where(lambda x: x == 50).single(), number=COUNT)
         enumerable = timeit.timeit(lambda: Enumerable(int, self.values).where(lambda x: x == 50).single(), number=COUNT)
 
+        print('Where single')
         print(f'd: {default}')
         print(f'i: {iterable}')
         print(f'e: {enumerable}')