We see that there is Memory Leak when using Rad controls. IE process memory keeps increasing until the process crashes. I am attaching a sample webpage default.aspx. You could use it to simulate it. Leave the IE browsing running after navigating to the page. You gradually see that the memory consumed by IE increase. Please also note I have not written any javascript used default functionality provided as is. These application where in we use telerik run for long and ajax calls keep running in the background and hence they are crashing. Please do have a look and if possible let us know if there is any way to avoid it. version of telerik that we have tried: 2012.3.1308.40 & 2013.1.220.0 version of IE used 8.0.760.1.17514 other versions of IE also have the issue. Hope you respond soon.