You consult with HR manager.
Since HRM is a body meant for the employees, carrying out timely performance appraisals is a given. Performance appraisals help in employee motivation by encouraging them to work to their fullest potential. It also enables to give them feedback on their work and suggest necessary measures for the same. This helps employees to have a clear view of what is expected of them and what they are delivering. They can thus, work better towards improving their performance and achieving targets.
The role of HR (especially the HR manager) in this would be to have a policy of generating timely appraisal reports and a review of the same by the authorities. The HR team should communicate individually with employees and give a clear feedback or suggestion on their performance. A system to reward employees excelling at their work would help in employee motivation and thus garner a higher degree of productivity and employee engagement.