Bing Maps with pins and cluster loses click handler and has bad performance - bing-maps

Question

I have a Bing map with pins and clusters.
I noticed performance issues and bugs in this combination. I have setup a demo using code from the official docs.
1st issue: Pins click handler are not clickable anymore after zooming
Steps to reproduce:
Load the above demo
Hover over a single pink pin => its clickable (cursor is hand/pointer)
Click on the + button to zoom in
Some of the single pink pins are not clickable anymore (cursor is default)
2nd issue: Really bad performance when the map is initialised
It looks like this is caused to many, many _initiateRequest, _setImage or downloadImage calls within the Bing Maps JavaScript. See this perf screenshot taken with Firefox Performance tool:
This performance hog drops to about the half if no icon param is passed, that is, in the demo this is commented out so that just 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)
});
N.B. in the demo only the cluster has a custom icon setting. The performance gets much, much worse if also all the pins get a custom icon setting. It does not matter whether the icon is SVG or PNG, both are really bad performance and the Bing Maps seems to trigger DOM events and old browsers like IE11 even hang for several seconds.

Answer 1

Try using the experimental branch. There has been a ton of updates added to it which address these issues. You can try it by adding "&branch=experimental" to the map script URL. The main release branch will be updated with the updates in the experimental branch in the next 2 weeks.