Broadcast Traffic SSL VPN

We are using f5 as a ssl vpn and more than 700 remote user's connect through broadband from remote location using network tunnel access mode.Now a days we got more traffic on firewall(checkpoint) and due more concretion's the firewall (checkpoint) performance getting low. And found in firewall we got a more broadcast traffic for f5 vpn client's , Pls suggest there is any fine-tune or setting's to be disable on client virtual vpn adapter settings to block broadcasting.

Regards, Mariappan S