Insight captures the Peak Working Set value of the process’s RAM usage. This data is used when reports are generated for reviewing application memory usage reports.
When reviewing the data within the Insight report for Application Memory it’s important to understand that this is reporting on the PEAK working set.
By default, Task Manager shows the Private Working Set, therefore discrepancies can be seen if you are comparing the data to task manager.
A feature request has been submitted to improve the report to allow the users to report on the Private working set also.