How do I optimize Symantec Endpoint Protection in a domain?

Question

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Good day. I ran into the following problem, the client part of the antivirus simply kills the performance of workstations in the bud. Maybe someone has come across a similar situation or can just set the right direction to investigate the incident.
There are two obvious problems:
Overestimated RAM consumption.
Huge read/write values ​​from HDD.
OS used Win XP SP3

Answer 1

Install nod32

Answer 2

And what version of SEP? We have 12.1.3 in the organization, a managed client and there are no particular complaints.