diff --git a/core/Action/Sequence.cpp b/core/Action/Sequence.cpp
index 693c8117..56408045 100644
--- a/core/Action/Sequence.cpp
+++ b/core/Action/Sequence.cpp
@@ -111,10 +111,7 @@ e2d::Sequence * e2d::Sequence::reverse() const
 		std::vector<Action*> newActions(_actions.size());
 		for (auto iter = _actions.crbegin(), iterCrend = _actions.crend(); iter != iterCrend; ++iter)
 		{
-			if (*iter)
-			{
-				newActions.push_back((*iter)->reverse());
-			}
+			newActions.push_back((*iter)->reverse());
 		}
 		sequence->add(newActions);
 	}
diff --git a/core/Action/Spawn.cpp b/core/Action/Spawn.cpp
index 97adf2e9..89835179 100644
--- a/core/Action/Spawn.cpp
+++ b/core/Action/Spawn.cpp
@@ -109,10 +109,7 @@ e2d::Spawn * e2d::Spawn::reverse() const
 		std::vector<Action*> newActions(_actions.size());
 		for (auto iter = _actions.crbegin(), iterCrend = _actions.crend(); iter != iterCrend; ++iter)
 		{
-			if (*iter)
-			{
-				newActions.push_back((*iter)->reverse());
-			}
+			newActions.push_back((*iter)->reverse());
 		}
 		spawn->add(newActions);
 	}
diff --git a/core/Manager/ActionManager.cpp b/core/Manager/ActionManager.cpp
index e23d109c..7f8e1301 100644
--- a/core/Manager/ActionManager.cpp
+++ b/core/Manager/ActionManager.cpp
@@ -37,6 +37,7 @@ void e2d::ActionManager::update()
 		return;
 
 	std::vector<Action*> currActions;
+	currActions.reserve(_runningActions.size());
 	std::copy_if(
 		_runningActions.begin(),
 		_runningActions.end(),
diff --git a/core/Manager/CollisionManager.cpp b/core/Manager/CollisionManager.cpp
index f6b06c90..aa24f1ee 100644
--- a/core/Manager/CollisionManager.cpp
+++ b/core/Manager/CollisionManager.cpp
@@ -51,6 +51,7 @@ void e2d::CollisionManager::__updateCollider(Collider* collider)
 		return;
 
 	std::vector<Collider*> currColliders;
+	currColliders.reserve(_colliders.size());
 	std::copy_if(
 		_colliders.begin(),
 		_colliders.end(),
diff --git a/core/Tool/Timer.cpp b/core/Tool/Timer.cpp
index 57a04a84..caeda070 100644
--- a/core/Tool/Timer.cpp
+++ b/core/Tool/Timer.cpp
@@ -116,6 +116,7 @@ void e2d::Timer::update()
 		return;
 
 	std::vector<Task*> currTasks;
+	currTasks.reserve(_tasks.size());
 	std::copy_if(
 		_tasks.begin(),
 		_tasks.end(),