Setting separate ip for each domain is better or keeping shared ip for domains is ?

Hello All,
I have only three domains on Linux 9 server.Out of those three two create lot of traffic on server which includes mysql and httpd requests.
Currently we have only one ip address for all these three domains.But now I want to assign separate ip for those two domains.Should I go for that?or it is better to keep shared one?What are pros and cons?
And if I want to then can anybosy help me how should i set up a separate ip for domains.I use WHM 9.4 version on RH 9.0 server.
PLease help.

 

 

 

 

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