Don't use fade effect on labels.

examples/mobile-wmts-vienna.css

@@ -9,7 +9,7 @@ html, body, #map {
 #title, #tags, #shortdesc {
     display: none;
 }
-.olTileImage {
+.olLayerGrid .olTileImage {
     -webkit-transition: opacity 0.2s linear;
     -moz-transition: opacity 0.2s linear;
     -o-transition: opacity 0.2s linear;

examples/mobile-wmts-vienna.js

@@ -164,7 +164,7 @@ var map;
             ));
             labels = format.createLayer(caps, OpenLayers.Util.applyDefaults(
                 {layer:"beschriftung", requestEncoding:"REST", isBaseLayer: false},
-                defaults
+                OpenLayers.Util.extend({className: "nofade"}, defaults)
             ));
             map.addLayers([fmzk, aerial, labels]);
             zoomToInitialExtent();
@@ -202,7 +202,8 @@ var map;
         layer: "beschriftung",
         style: "normal",
         transitionEffect: null,
-        isBaseLayer: false
+        isBaseLayer: false,
+        className: "nofade"
     },
     defaults));
     map.addLayers([fmzk, aerial, labels]);