diff --git a/dist/torque.uncompressed.js b/dist/torque.uncompressed.js
index 3dd8d28..a189714 100644
--- a/dist/torque.uncompressed.js
+++ b/dist/torque.uncompressed.js
@@ -626,6 +626,10 @@ exports.torque.common.TorqueLayer = TorqueLayer;
     return exports.torque.extend({}, a);
   }
 
+  exports.torque.isFunction = function(f) {
+    return typeof f == 'function' || false;
+  }
+
   exports.torque.isArray = function(value) {
       return value && typeof value == 'object' && Object.prototype.toString.call(value) == '[object Array]';
   };
@@ -641,6 +645,10 @@ exports.torque.common.TorqueLayer = TorqueLayer;
     return !!document.createElement('canvas');
   };
 
+  exports.torque.flags = {
+    sprites_to_images: navigator.userAgent.indexOf('Safari') === -1
+  }
+
 })(typeof exports === "undefined" ? this : exports);
 
 if (typeof module !== "undefined") {
@@ -1976,11 +1984,12 @@ exports.Profiler = Profiler;
       return refresh;
     },
 
-    _extraParams: function() {
-      if (this.options.extra_params) {
+    _extraParams: function(e) {
+      e = torque.extend(torque.extend({}, e), this.options.extra_params);
+      if (e) {
         var p = [];
-        for(var k in this.options.extra_params) {
-          var v = this.options.extra_params[k];
+        for(var k in e) {
+          var v = e[k];
           if (v) {
             if (torque.isArray(v)) {
               for (var i = 0, len = v.length; i < len; i++) {
@@ -2136,7 +2145,6 @@ exports.Profiler = Profiler;
       if(named) {
         //tiles/template
         url = this._tilerHost() + "/api/v1/map/named/" + named.name + "/jsonp"
-        //url = this._tilerHost() + "/map/" + named.name + "/jsonp"
       } else {
         layergroup = {
           "version": "1.0.1",
@@ -2151,7 +2159,7 @@ exports.Profiler = Profiler;
           }]
         };
       }
-      var extra = this._extraParams();
+      var extra = this._extraParams(this.options.stat_tag ? { stat_tag: this.options.stat_tag }: {} );
 
       // tiler needs map_key instead of api_key
       // so replace it
@@ -2207,6 +2215,10 @@ exports.Profiler = Profiler;
      // function name
      var fnName = options.callbackName || 'torque_' + Date.now();
 
+     if (torque.isFunction(fnName)) {
+       fnName = fnName();
+     }
+
      function clean() {
        head.removeChild(script);
        clearTimeout(timeoutTimer);
@@ -2297,6 +2309,10 @@ exports.Profiler = Profiler;
   exports.torque = exports.torque || {};
 
   var TAU = Math.PI*2;
+  // min value to render a line. 
+  // it does not make sense to render a line of a width is not even visible
+  var LINEWIDTH_MIN_VALUE = 0.05; 
+
   function renderPoint(ctx, st) {
     ctx.fillStyle = st.fillStyle;
     var pixel_size = st['point-radius'];
@@ -2316,7 +2332,7 @@ exports.Profiler = Profiler;
 
     // stroke
     ctx.globalAlpha = 1.0;
-    if (st.strokeStyle && st.lineWidth) {
+    if (st.strokeStyle && st.lineWidth && st.lineWidth > LINEWIDTH_MIN_VALUE) {
       if (st.strokeOpacity) {
         ctx.globalAlpha = st.strokeOpacity;
       }
@@ -2448,7 +2464,11 @@ exports.Profiler = Profiler;
 
       var pointSize = st['point-radius'];
       if (!pointSize) {
-        throw new Error("marker-width property should be set");
+        return null;
+      }
+
+      if (st.fillOpacity === 0 && !st.strokeOpacity) {
+        return null;
       }
 
       var canvas = document.createElement('canvas');
@@ -2470,9 +2490,12 @@ exports.Profiler = Profiler;
         }
       }
       prof.end(true);
-      var i = new Image();
-      i.src = canvas.toDataURL();
-      return i;
+      if (torque.flags.sprites_to_images) {
+        var i = new Image();
+        i.src = canvas.toDataURL();
+        return i;
+      }
+      return canvas;
     },
 
     //
@@ -2522,12 +2545,14 @@ exports.Profiler = Profiler;
           var c = tile.renderData[pixelIndex + p];
           if(c) {
            var sp = sprites[c];
-           if(!sp) {
+           if(sp === undefined) {
              sp = sprites[c] = this.generateSprite(shader, c, _.extend({ zoom: tile.z, 'frame-offset': frame_offset }, shaderVars));
            }
-           var x = tile.x[posIdx]- (sp.width >> 1);
-           var y = tileMax - tile.y[posIdx]; // flip mercator
-           ctx.drawImage(sp, x, y - (sp.height >> 1));
+           if (sp) {
+             var x = tile.x[posIdx]- (sp.width >> 1);
+             var y = tileMax - tile.y[posIdx]; // flip mercator
+             ctx.drawImage(sp, x, y - (sp.height >> 1));
+           }
           }
         }
       }