I tried to reproduce a similar scenario as yours with our latest official release and the application worked well. Could you give your app a try with the latest official release(Version 2012.1.326.40 ) and confirm if the issue still appears. I would also recommend you to take a look at our Performance Tips and Tricks
topic as it might help you in resolving the issue.
Alternatively you may check out our new RadChartView
control which is designed with performance in mind and I am sure you would be pleased with the results.
Hope this helps.
All the best,
the Telerik team
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