WebShield slowing down website performance

Hi,
I work for a corporate banking firm and we have some users of ours complaining about application performance - They have Avast installed on their workstations and capturing logs via Fiddler shows Avast sending requests to its server for rating / validation during the process of application loading and app load requests are waiting on this.
Is there anything we can do globally to avoid this?
Or any settings on user side to avoid this?

Please advise.