No need to enable FZ every frame.

Qt/QtHost.cpp

@@ -432,8 +432,7 @@ void NativeInitGraphics()
 
 void NativeRender()
 {
-	EnableFZ();
-    // Clearing the screen at the start of the frame is an optimization for tiled mobile GPUs, as it then doesn't need to keep it around between frames.
+	// Clearing the screen at the start of the frame is an optimization for tiled mobile GPUs, as it then doesn't need to keep it around between frames.
 	glClearColor(0,0,0,1);
 	glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 

UI/NativeApp.cpp

@@ -569,8 +569,6 @@ void TakeScreenshot() {
 }
 
 void NativeRender() {
-	EnableFZ();
-
 	glstate.depthWrite.set(GL_TRUE);
 	glstate.colorMask.set(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);