The "swjobengineworker2x64" is the 64bit worker process used by SAM for monitoring applications that require 64bit polling. These are typically limited to PowerShell Script Monitors, but occasionally can be used with ODBC User Experience Monitors. The job engine worker process platform option is available from editing the assigned application, expanding the "Advanced" section, and viewing the "Platform to run polling job on". What applications are you monitoring in your environment, and what component monitor types are used within those templates that are configured to use the "x64" Job Engine?