hi @Andaman 

Well, I would suggest to hire a Commvault Expert to audit your architecture and find out the bottleneck.

I’m convinced you would understand that with very few information about your current environment , workload, settings and expectations, it’s nearly impossible to provide an accurate answer.

Regards,

Laurent. 

@Andaman , I concur with @Laurent .  You should request a site review from Professional Services via your Account Rep.

I would also start by taking a look at your Media Agents and checking our sizing guides to make sure you have adequate hardware:

https://documentation.commvault.com/11.25/expert/111985_hardware_specifications_for_deduplication_mode.html

Also, make sure that any threat detection, anti-virus or other security software has the recommended Commvault Exclusions in place as these can have a detrimental effect on performance.

For Windows: https://documentation.commvault.com/11.24/expert/8665_recommended_antivirus_exclusions_for_windows.html

For Linux/Unix: https://documentation.commvault.com/11.24/expert/8670_recommended_antivirus_exclusions_for_unix_and_macintosh.html