I can't really think of performance bottlenecks which apply for SAX but not DOM -- of course, bad code is bad code so a programmer could cause performance bottlenecks with both DOM and SAX. However, I do know that your display name does not comply with our naming policy so I'll have to ask you to change it. Thanks.
SAX performs better than DOM. I dont see any bottle necks here. Ofcourse programmer must write good code. You can also see new StAX API which is pull based API and can also be used to create XML document unlike SAX