We are using this control in timeline mode in one of our products and with growing number of resources and events the control became really slow in rendering (initially and after any navigation). As in an example below, it behaves as described even without events, just with 500 rows of resources:
http://dojo.telerik.com/IxAwe/3.
We are looking forward to any advice how to improve user experience with such amount of data (we can't always filter resources or events just because we have to show all perspective in most common view).