diff --git a/src/ol/render/canvas/canvasimmediate.js b/src/ol/render/canvas/canvasimmediate.js
index cfcd5b1118..5f40249903 100644
--- a/src/ol/render/canvas/canvasimmediate.js
+++ b/src/ol/render/canvas/canvasimmediate.js
@@ -39,13 +39,6 @@ goog.require('ol.vec.Mat4');
 ol.render.canvas.Immediate = function(context, pixelRatio, extent, transform, viewRotation) {
   goog.base(this);
 
-  /**
-   * @private
-   * @type {!Object.<string,
-   *        Array.<function(ol.render.canvas.Immediate)>>}
-   */
-  this.callbacksByZIndex_ = {};
-
   /**
    * @private
    * @type {CanvasRenderingContext2D}
@@ -402,26 +395,6 @@ ol.render.canvas.Immediate.prototype.drawRings_ = function(flatCoordinates, offs
 };
 
 
-/**
- * Register a function to be called for rendering at a given zIndex.  The
- * function will be called asynchronously.  The callback will receive a
- * reference to {@link ol.render.canvas.Immediate} context for drawing.
- *
- * @param {number} zIndex Z index.
- * @param {function(ol.render.canvas.Immediate)} callback Callback.
- * @api
- */
-ol.render.canvas.Immediate.prototype.drawAsync = function(zIndex, callback) {
-  var zIndexKey = zIndex.toString();
-  var callbacks = this.callbacksByZIndex_[zIndexKey];
-  if (callbacks !== undefined) {
-    callbacks.push(callback);
-  } else {
-    this.callbacksByZIndex_[zIndexKey] = [callback];
-  }
-};
-
-
 /**
  * Render a circle geometry into the canvas.  Rendering is immediate and uses
  * the current fill and stroke styles.
@@ -725,23 +698,6 @@ ol.render.canvas.Immediate.prototype.drawMultiPolygon = function(geometry) {
 };
 
 
-/**
- * FIXME: empty description for jsdoc
- */
-ol.render.canvas.Immediate.prototype.flush = function() {
-  /** @type {Array.<number>} */
-  var zs = Object.keys(this.callbacksByZIndex_).map(Number);
-  zs.sort(ol.array.numberSafeCompareFunction);
-  var i, ii, callbacks, j, jj;
-  for (i = 0, ii = zs.length; i < ii; ++i) {
-    callbacks = this.callbacksByZIndex_[zs[i].toString()];
-    for (j = 0, jj = callbacks.length; j < jj; ++j) {
-      callbacks[j](this);
-    }
-  }
-};
-
-
 /**
  * @param {ol.render.canvas.FillState} fillState Fill state.
  * @private
diff --git a/src/ol/renderer/canvas/canvaslayerrenderer.js b/src/ol/renderer/canvas/canvaslayerrenderer.js
index e34f430fcf..9e6a02a8ce 100644
--- a/src/ol/renderer/canvas/canvaslayerrenderer.js
+++ b/src/ol/renderer/canvas/canvaslayerrenderer.js
@@ -127,7 +127,6 @@ ol.renderer.canvas.Layer.prototype.dispatchComposeEvent_ = function(type, contex
     var composeEvent = new ol.render.Event(type, layer, render, frameState,
         context, null);
     layer.dispatchEvent(composeEvent);
-    render.flush();
     ol.render.canvas.rotateAtOffset(context, rotation, width / 2, height / 2);
   }
 };
diff --git a/src/ol/renderer/canvas/canvasmaprenderer.js b/src/ol/renderer/canvas/canvasmaprenderer.js
index 2a19ddd023..09f9d2d37d 100644
--- a/src/ol/renderer/canvas/canvasmaprenderer.js
+++ b/src/ol/renderer/canvas/canvasmaprenderer.js
@@ -138,8 +138,6 @@ ol.renderer.canvas.Map.prototype.dispatchComposeEvent_ = function(type, frameSta
     var composeEvent = new ol.render.Event(type, map, vectorContext,
         frameState, context, null);
     map.dispatchEvent(composeEvent);
-
-    vectorContext.flush();
   }
 };
 
diff --git a/src/ol/renderer/dom/dommaprenderer.js b/src/ol/renderer/dom/dommaprenderer.js
index 60a9fbe72e..bf57efab58 100644
--- a/src/ol/renderer/dom/dommaprenderer.js
+++ b/src/ol/renderer/dom/dommaprenderer.js
@@ -138,7 +138,6 @@ ol.renderer.dom.Map.prototype.dispatchComposeEvent_ = function(type, frameState)
     var composeEvent = new ol.render.Event(type, map, vectorContext,
         frameState, context, null);
     map.dispatchEvent(composeEvent);
-    vectorContext.flush();
   }
 };
 
diff --git a/src/ol/renderer/dom/domvectorlayerrenderer.js b/src/ol/renderer/dom/domvectorlayerrenderer.js
index b367f811d0..30bae5161c 100644
--- a/src/ol/renderer/dom/domvectorlayerrenderer.js
+++ b/src/ol/renderer/dom/domvectorlayerrenderer.js
@@ -175,7 +175,6 @@ ol.renderer.dom.VectorLayer.prototype.dispatchEvent_ = function(type, frameState
     var event = new ol.render.Event(type, layer, render, frameState,
         context, null);
     layer.dispatchEvent(event);
-    render.flush();
   }
 };
 
diff --git a/test/spec/ol/render/canvasimmediate.test.js b/test/spec/ol/render/canvasimmediate.test.js
index 8c4f6ca74a..9575bde38c 100644
--- a/test/spec/ol/render/canvasimmediate.test.js
+++ b/test/spec/ol/render/canvasimmediate.test.js
@@ -21,21 +21,6 @@ describe('ol.render.canvas.Immediate', function() {
     });
   });
 
-  describe('#flush', function() {
-    it('calls callback in correct z-order', function() {
-      var canvas = new ol.render.canvas.Immediate();
-      var log = [];
-      canvas.drawAsync(11, function() {
-        log.push(11);
-      });
-      canvas.drawAsync(5, function() {
-        log.push(5);
-      });
-      canvas.flush();
-      expect(log).to.eql([5, 11]);
-    });
-  });
-
   describe('#setStyle()', function() {
     it('calls the more specific methods with style parts', function() {
       var context = new ol.render.canvas.Immediate();