option to remove point without redraw for performance, see phetsims/e…

…nergy-skate-park#198

js/DynamicSeries.js

@@ -131,14 +131,17 @@ define( require => {
      * Remove a point in the data series with the provided x value. Does not remove duplicates, only the first
      * occurrence of the value starting at the beginning of the xPoints list.
      * @param {number} x
+     * @param {boolean} withRedraw - if false, points can be removed without emitting to redraw (for performance)
      * @public
      */
-    removePointAtX( x ) {
+    removePointAtX( x, withRedraw = true ) {
       for ( let i = 0; i < this.data.length; i++ ) {
         const point = this.data[ i ];
         if ( point.x === x ) {
           this.data.splice( i, 1 );
-          this.emitter.emit();
+          if ( withRedraw ) {
+            this.emitter.emit();
+          }
           break;
         }
       }