Script Timeout

Hi,

I am  using a large XMLList which is processing for some calculations. it is giving the below mentioned error message.

Error: Error #1502: A script has executed for longer than the default timeout period of 15 seconds.

Statment : var objectCount:int = objMain.subjObj.subjectContent..*.(hasOwnProperty('@id') && @iD84_2 == itemId).@objectCount;

Is there any way to achieve it in a faster way. Looking forword.

Thanks ----- Amit