Dear Saikrishna,
More than processing, your focus should be on measurement. Any PMS, whether old or new, traditional or modern, IT-assisted or manual, that measures what deserves to be measured is fine. There are cases where HR adhered to this or that PMS, but the way organizational performance needs to be measured was not considered. Secondly, PMS should percolate down to the last level. This has not happened in many organizations, notwithstanding heavy investment in IT-assisted PMS.
To institute a PMS, you must identify the KPIs associated with each department. Related to this subject, I have provided a comprehensive reply. You may click the following link to refer to it:
https://www.citehr.com/526357-kpi-kra.html
The above link will clarify many doubts. The link has further links. These links, in turn, have still further links. You may go through all the links patiently to understand the subject completely.
Thanks,
Dinesh Divekar