I am interested to get Microsoft Certification for "Performance Testing" in Visual Studio Ultimate 2012. Is microsoft conducting such certification exam for "Performance Testing" ?
No, there is no exam that is so specific as to only test for "performance testing." However, the topic is included within other "larger" certifications. For instance, if you are pursuing a certification on Windows Store Apps, exam 70-482
in its objective "prepare for a solution deployment", section "design and implement a test strategy", covers "...design a reliability test plan, including
performance testing, stress testing, scalability testing, and duration testing".