There are two group options when connecting to AnyConnect: General-Use and Library-Resources.
Logging into the Library-Resources group may slow down your network connection. Because the library resources are external to UIC, all internet traffic will have to be routed through the VPN. This creates overhead by encrypting and decrypting all data sent over the internet. The General-Use group will only send data sent to on-campus IP addresses through the VPN, thus incurring much less overhead.
See also What group should I use for AnyConnect VPN?