Select a system where you need to modify the policy.
Click Actions and select Agent, Modify Policies on a Single System.
Select Endpoint Security Threat Prevention from the Product drop-down list.
Select the On-Access Scan policy.
Click Show Advanced.
Navigate to the Process Settings section, Exclusions list.
Select File type (can include the ? wildcard) and type the first extension "arc" from the list above.
Repeat steps 9–11 to add the rest of the extensions.
If its still utilizes high CPU then you may refer following instruction to enable OAS activity Monitor and capture its logs to confirm the scanning request and try excluding those highest scanning request.
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