Hello,
The warning below is posted in SuiteAnswers Article: Using the Script Performance Monitor (Answer ID: 29697)
As of May 2015, the Script Performance Monitor is not available for new installations. If you have already installed this SuiteApp, it should continue to work normally, but you can no longer install it. The Script Performance Monitor has been deprecated by the Application Performance Management (Beta) SuiteApp. This new SuiteApp includes performance data provided by the Script Performance Monitor, as well as additional performance metrics. If you would like access to the limited beta version of the Application Performance Management SuiteApp, please contact NetSuite Support.