Virtual Earth Map Control v6 is available
Details here. One of the things that may not be obvious is that the new control is backward compatible with v5. If you have a built your solution on v5, then you can update your script reference to get all the perf enhancements in the new control! All you have to do is change on line of code from (for example):
<script type="text/javascript" src="https://dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=5" mce_src="https://dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=5"></script>
to
<script type="text/javascript" src="https://dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6" mce_src="https://dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6"></script>
-Marc
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