Bing Maps with pins and cluster loses click handler and has poor performance

I have a Bing map with pins and clusters.

I noticed performance issues and bugs in this combination. I installed the demo using code from the official docs .

1st issue: click handler is no longer available after zooming

Steps to reproduce:

• Download the above demo
• Hover over one pink contact => its clickable (cursor is hand / pointer)
• Press the + button to zoom in
• Some of the individual pink contacts are no longer clickable (default cursor)

Second problem: really bad performance when initializing the card

It looks like it's caused by many, many calls _initiateRequest

, _setImage

or downloadImage

in JavaScript Bing Maps. See this performance captured with the Firefox Performance tool:

This performance metric drops to about half if the parameter is not passed icon

, i.e. in the demo this is commented out so that only the default Bing Maps icons are used:

cluster.setOptions({
  // commenting this out improves performance
  // icon: svg.join(''),
  anchor: new Microsoft.Maps.Point(radius, radius),
  textOffset: new Microsoft.Maps.Point(0, radius - 8)
});

      

        
        
        
      

    

NB in ​​the demo only the cluster has a configurable parameter icon

. Performance gets much, much worse if all pins get a configurable parameter as well icon

. It doesn't matter if the icon is SVG or PNG, both are very bad, and Bing Maps seems to fire DOM events and older browsers like IE11 even hang for a few seconds.