The Cisco AnyConnect Client on Mac OS X seems to install two components: the VPN client and a Web security module. Based on my experience, the Web security module is always running (as a process named acwebsecagent) and consuming network bandwidth. If you don’t need the Web security module, you can uninstall it by running:
To uninstall the Web security module, just run:
sudo /opt/cisco/anyconnect/bin/websecurity_uninstall.sh
Credit for this: No to Cisco Web Security
felipe-alfaro.com 
Thank you!
how about windows users that sees no websecurity_uninstall.sh ?
What steps should they take ?
Thank you.. seems like the my browser is a bit faster! Awesome.
so much – thank you – so much!!!
一直占用端口 5001 5003
Sweet! Thanks for posting this.
thanks !!! saved me with mojave kext issues after update just now