diff --git a/CMakeLists.txt b/CMakeLists.txt
index b27f8862de..1def1867f2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,7 +40,8 @@ if (WIN32)
   endif ()
   message (WINDOW_SDK_PATH= ${WINDOW_SDK_PATH})
   set(CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH} ${WINDOW_SDK_PATH})
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")
+  # /wd4351 disables warning C4351: new behavior: elements of array will be default initialized
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP /wd4351")
   # /LARGEADDRESSAWARE enables 32-bit apps to use more than 2GB of memory.
   # Caveats: http://stackoverflow.com/questions/2288728/drawbacks-of-using-largeaddressaware-for-32-bit-windows-executables
   # TODO: Remove when building 64-bit.
diff --git a/interface/src/avatar/Avatar.h b/interface/src/avatar/Avatar.h
index 939161327b..0cdaf36099 100644
--- a/interface/src/avatar/Avatar.h
+++ b/interface/src/avatar/Avatar.h
@@ -147,9 +147,9 @@ public:
     
     Q_INVOKABLE glm::vec3 getNeckPosition() const;
 
-    Q_INVOKABLE glm::vec3 getAcceleration()  { return _acceleration; }
-    Q_INVOKABLE glm::vec3 getAngularVelocity() { return _angularVelocity; }
-    Q_INVOKABLE glm::vec3 getAngularAcceleration() { return _angularAcceleration; }
+    Q_INVOKABLE const glm::vec3& getAcceleration() const { return _acceleration; }
+    Q_INVOKABLE const glm::vec3& getAngularVelocity() const { return _angularVelocity; }
+    Q_INVOKABLE const glm::vec3& getAngularAcceleration() const { return _angularAcceleration; }
     
 
     /// Scales a world space position vector relative to the avatar position and scale
diff --git a/interface/src/devices/DdeFaceTracker.cpp b/interface/src/devices/DdeFaceTracker.cpp
index fba37736e3..27e15cea0e 100644
--- a/interface/src/devices/DdeFaceTracker.cpp
+++ b/interface/src/devices/DdeFaceTracker.cpp
@@ -141,13 +141,6 @@ static const float STARTING_DDE_MESSAGE_TIME = 0.033f;
 static const float DEFAULT_DDE_EYE_CLOSING_THRESHOLD = 0.8f;
 static const int CALIBRATION_SAMPLES = 150;
 
-#ifdef WIN32
-//  warning C4351: new behavior: elements of array 'DdeFaceTracker::_lastEyeBlinks' will be default initialized 
-//  warning C4351: new behavior: elements of array 'DdeFaceTracker::_filteredEyeBlinks' will be default initialized
-//  warning C4351: new behavior: elements of array 'DdeFaceTracker::_lastEyeCoefficients' will be default initialized
-#pragma warning(disable:4351) 
-#endif
-
 DdeFaceTracker::DdeFaceTracker() :
     DdeFaceTracker(QHostAddress::Any, DDE_SERVER_PORT, DDE_CONTROL_PORT)
 {
@@ -214,10 +207,6 @@ DdeFaceTracker::~DdeFaceTracker() {
     }
 }
 
-#ifdef WIN32
-#pragma warning(default:4351) 
-#endif
-
 void DdeFaceTracker::init() {
     FaceTracker::init();
     setEnabled(Menu::getInstance()->isOptionChecked(MenuOption::UseCamera) && !_isMuted);
diff --git a/libraries/avatars/src/AvatarData.h b/libraries/avatars/src/AvatarData.h
index a27e4256ef..603b5d76ea 100644
--- a/libraries/avatars/src/AvatarData.h
+++ b/libraries/avatars/src/AvatarData.h
@@ -301,7 +301,7 @@ public:
     int getReceiveRate() const;
 
     void setVelocity(const glm::vec3 velocity) { _velocity = velocity; }
-    Q_INVOKABLE glm::vec3 getVelocity() const { return _velocity; }
+    Q_INVOKABLE const glm::vec3& getVelocity() const { return _velocity; }
     const glm::vec3& getTargetVelocity() const { return _targetVelocity; }
 
     bool shouldDie() const { return _owningAvatarMixer.isNull() || getUsecsSinceLastUpdate() > AVATAR_SILENCE_THRESHOLD_USECS; }
diff --git a/libraries/networking/src/Assignment.cpp b/libraries/networking/src/Assignment.cpp
index 944041730e..a4fa246c93 100644
--- a/libraries/networking/src/Assignment.cpp
+++ b/libraries/networking/src/Assignment.cpp
@@ -32,12 +32,6 @@ Assignment::Type Assignment::typeForNodeType(NodeType_t nodeType) {
     }
 }
 
-#ifdef WIN32
-//warning C4351: new behavior: elements of array 'Assignment::_payload' will be default initialized 
-// We're disabling this warning because the new behavior which is to initialize the array with 0 is acceptable to us.
-#pragma warning(disable:4351) 
-#endif
-
 Assignment::Assignment() :
     _uuid(),
     _command(Assignment::RequestCommand),