diff --git a/packages/core/src/Renderer.js b/packages/core/src/Renderer.js
index 96d673f..14ca433 100644
--- a/packages/core/src/Renderer.js
+++ b/packages/core/src/Renderer.js
@@ -325,6 +325,9 @@
         this.runners.prerender.run();
         this.emit('prerender');
 
+        // apply a transform at a GPU level
+        this.projection.transform = transform;
+
         // no point rendering if our context has been blown up!
         if (this.context.isLost)
         {
@@ -367,6 +370,9 @@
 
         this.runners.postrender.run();
 
+        // reset transform after render
+        this.projection.transform = null;
+
         this.emit('postrender');
     }
 

diff --git a/packages/core/src/Renderer.js b/packages/core/src/Renderer.js
index 96d673f..14ca433 100644
--- a/packages/core/src/Renderer.js
+++ b/packages/core/src/Renderer.js
@@ -325,6 +325,9 @@
         this.runners.prerender.run();
         this.emit('prerender');
 
+        // apply a transform at a GPU level
+        this.projection.transform = transform;
+
         // no point rendering if our context has been blown up!
         if (this.context.isLost)
         {
@@ -367,6 +370,9 @@
 
         this.runners.postrender.run();
 
+        // reset transform after render
+        this.projection.transform = null;
+
         this.emit('postrender');
     }
 
diff --git a/packages/core/src/textures/BaseTexture.js b/packages/core/src/textures/BaseTexture.js
index 98573ff..67e281b 100644
--- a/packages/core/src/textures/BaseTexture.js
+++ b/packages/core/src/textures/BaseTexture.js
@@ -645,6 +645,6 @@
  * Global number of the texture batch, used by multi-texture renderers
  *
  * @static
- * @member {number} new texture batch number
+ * @member {number}
  */
 BaseTexture._globalBatch = 0;

diff --git a/packages/core/src/Renderer.js b/packages/core/src/Renderer.js
index 96d673f..14ca433 100644
--- a/packages/core/src/Renderer.js
+++ b/packages/core/src/Renderer.js
@@ -325,6 +325,9 @@
         this.runners.prerender.run();
         this.emit('prerender');
 
+        // apply a transform at a GPU level
+        this.projection.transform = transform;
+
         // no point rendering if our context has been blown up!
         if (this.context.isLost)
         {
@@ -367,6 +370,9 @@
 
         this.runners.postrender.run();
 
+        // reset transform after render
+        this.projection.transform = null;
+
         this.emit('postrender');
     }
 
diff --git a/packages/core/src/textures/BaseTexture.js b/packages/core/src/textures/BaseTexture.js
index 98573ff..67e281b 100644
--- a/packages/core/src/textures/BaseTexture.js
+++ b/packages/core/src/textures/BaseTexture.js
@@ -645,6 +645,6 @@
  * Global number of the texture batch, used by multi-texture renderers
  *
  * @static
- * @member {number} new texture batch number
+ * @member {number}
  */
 BaseTexture._globalBatch = 0;
diff --git a/packages/interaction/src/InteractionManager.js b/packages/interaction/src/InteractionManager.js
index fd76700..b908dde 100644
--- a/packages/interaction/src/InteractionManager.js
+++ b/packages/interaction/src/InteractionManager.js
@@ -1038,7 +1038,9 @@
             }
             interactiveParent = false;
         }
-        // If there is a mask, no need to test against anything else if the pointer is not within the mask
+        // If there is a mask, no need to hitTest against anything else if the pointer is not within the mask.
+        // We still want to hitTestChildren, however, to ensure a mouseout can still be generated.
+        // https://github.com/pixijs/pixi.js/issues/5135
         else if (displayObject._mask)
         {
             if (hitTest)
@@ -1046,7 +1048,6 @@
                 if (!(displayObject._mask.containsPoint && displayObject._mask.containsPoint(point)))
                 {
                     hitTest = false;
-                    hitTestChildren = false;
                 }
             }
         }

diff --git a/packages/core/src/Renderer.js b/packages/core/src/Renderer.js
index 96d673f..14ca433 100644
--- a/packages/core/src/Renderer.js
+++ b/packages/core/src/Renderer.js
@@ -325,6 +325,9 @@
         this.runners.prerender.run();
         this.emit('prerender');
 
+        // apply a transform at a GPU level
+        this.projection.transform = transform;
+
         // no point rendering if our context has been blown up!
         if (this.context.isLost)
         {
@@ -367,6 +370,9 @@
 
         this.runners.postrender.run();
 
+        // reset transform after render
+        this.projection.transform = null;
+
         this.emit('postrender');
     }
 
diff --git a/packages/core/src/textures/BaseTexture.js b/packages/core/src/textures/BaseTexture.js
index 98573ff..67e281b 100644
--- a/packages/core/src/textures/BaseTexture.js
+++ b/packages/core/src/textures/BaseTexture.js
@@ -645,6 +645,6 @@
  * Global number of the texture batch, used by multi-texture renderers
  *
  * @static
- * @member {number} new texture batch number
+ * @member {number}
  */
 BaseTexture._globalBatch = 0;
diff --git a/packages/interaction/src/InteractionManager.js b/packages/interaction/src/InteractionManager.js
index fd76700..b908dde 100644
--- a/packages/interaction/src/InteractionManager.js
+++ b/packages/interaction/src/InteractionManager.js
@@ -1038,7 +1038,9 @@
             }
             interactiveParent = false;
         }
-        // If there is a mask, no need to test against anything else if the pointer is not within the mask
+        // If there is a mask, no need to hitTest against anything else if the pointer is not within the mask.
+        // We still want to hitTestChildren, however, to ensure a mouseout can still be generated.
+        // https://github.com/pixijs/pixi.js/issues/5135
         else if (displayObject._mask)
         {
             if (hitTest)
@@ -1046,7 +1048,6 @@
                 if (!(displayObject._mask.containsPoint && displayObject._mask.containsPoint(point)))
                 {
                     hitTest = false;
-                    hitTestChildren = false;
                 }
             }
         }
diff --git a/packages/mesh/src/Mesh.js b/packages/mesh/src/Mesh.js
index fd46cdd..b8d98d1 100644
--- a/packages/mesh/src/Mesh.js
+++ b/packages/mesh/src/Mesh.js
@@ -144,7 +144,7 @@
      */
     get uvBuffer()
     {
-        return this.geometry.buffers[1].data;
+        return this.geometry.buffers[1];
     }
 
     /**
@@ -155,7 +155,7 @@
      */
     get verticesBuffer()
     {
-        return this.geometry.buffers[0].data;
+        return this.geometry.buffers[0];
     }
 
     /**

diff --git a/packages/core/src/Renderer.js b/packages/core/src/Renderer.js
index 96d673f..14ca433 100644
--- a/packages/core/src/Renderer.js
+++ b/packages/core/src/Renderer.js
@@ -325,6 +325,9 @@
         this.runners.prerender.run();
         this.emit('prerender');
 
+        // apply a transform at a GPU level
+        this.projection.transform = transform;
+
         // no point rendering if our context has been blown up!
         if (this.context.isLost)
         {
@@ -367,6 +370,9 @@
 
         this.runners.postrender.run();
 
+        // reset transform after render
+        this.projection.transform = null;
+
         this.emit('postrender');
     }
 
diff --git a/packages/core/src/textures/BaseTexture.js b/packages/core/src/textures/BaseTexture.js
index 98573ff..67e281b 100644
--- a/packages/core/src/textures/BaseTexture.js
+++ b/packages/core/src/textures/BaseTexture.js
@@ -645,6 +645,6 @@
  * Global number of the texture batch, used by multi-texture renderers
  *
  * @static
- * @member {number} new texture batch number
+ * @member {number}
  */
 BaseTexture._globalBatch = 0;
diff --git a/packages/interaction/src/InteractionManager.js b/packages/interaction/src/InteractionManager.js
index fd76700..b908dde 100644
--- a/packages/interaction/src/InteractionManager.js
+++ b/packages/interaction/src/InteractionManager.js
@@ -1038,7 +1038,9 @@
             }
             interactiveParent = false;
         }
-        // If there is a mask, no need to test against anything else if the pointer is not within the mask
+        // If there is a mask, no need to hitTest against anything else if the pointer is not within the mask.
+        // We still want to hitTestChildren, however, to ensure a mouseout can still be generated.
+        // https://github.com/pixijs/pixi.js/issues/5135
         else if (displayObject._mask)
         {
             if (hitTest)
@@ -1046,7 +1048,6 @@
                 if (!(displayObject._mask.containsPoint && displayObject._mask.containsPoint(point)))
                 {
                     hitTest = false;
-                    hitTestChildren = false;
                 }
             }
         }
diff --git a/packages/mesh/src/Mesh.js b/packages/mesh/src/Mesh.js
index fd46cdd..b8d98d1 100644
--- a/packages/mesh/src/Mesh.js
+++ b/packages/mesh/src/Mesh.js
@@ -144,7 +144,7 @@
      */
     get uvBuffer()
     {
-        return this.geometry.buffers[1].data;
+        return this.geometry.buffers[1];
     }
 
     /**
@@ -155,7 +155,7 @@
      */
     get verticesBuffer()
     {
-        return this.geometry.buffers[0].data;
+        return this.geometry.buffers[0];
     }
 
     /**
diff --git a/packages/utils/src/browser/isWebGLSupported.js b/packages/utils/src/browser/isWebGLSupported.js
index 1a2b9e2..bc23866 100644
--- a/packages/utils/src/browser/isWebGLSupported.js
+++ b/packages/utils/src/browser/isWebGLSupported.js
@@ -1,3 +1,5 @@
+let supported;
+
 /**
  * Helper for checking for WebGL support.
  *
@@ -7,37 +9,45 @@
  */
 export function isWebGLSupported()
 {
-    const contextOptions = { stencil: true, failIfMajorPerformanceCaveat: true };
-
-    try
+    if (typeof supported === 'undefined')
     {
-        if (!window.WebGLRenderingContext)
+        supported = (function supported()
         {
-            return false;
-        }
+            const contextOptions = { stencil: true, failIfMajorPerformanceCaveat: true };
 
-        const canvas = document.createElement('canvas');
-        let gl = canvas.getContext('webgl', contextOptions) || canvas.getContext('experimental-webgl', contextOptions);
-
-        const success = !!(gl && gl.getContextAttributes().stencil);
-
-        if (gl)
-        {
-            const loseContext = gl.getExtension('WEBGL_lose_context');
-
-            if (loseContext)
+            try
             {
-                loseContext.loseContext();
+                if (!window.WebGLRenderingContext)
+                {
+                    return false;
+                }
+
+                const canvas = document.createElement('canvas');
+                let gl = canvas.getContext('webgl', contextOptions)
+                    || canvas.getContext('experimental-webgl', contextOptions);
+
+                const success = !!(gl && gl.getContextAttributes().stencil);
+
+                if (gl)
+                {
+                    const loseContext = gl.getExtension('WEBGL_lose_context');
+
+                    if (loseContext)
+                    {
+                        loseContext.loseContext();
+                    }
+                }
+
+                gl = null;
+
+                return success;
             }
-        }
-
-        gl = null;
-
-        return success;
+            catch (e)
+            {
+                return false;
+            }
+        })();
     }
-    catch (e)
-    {
-        return false;
-    }
+
+    return supported;
 }
-