Hi,
Symantec proxy does not have load balancing feature.
Below is the feature of Symantec proxy:
Control web and cloud usage with fast app performance
Establish negative-day threat defenses
Implement multi-authentication realm support
Gain visibility into encrypted web traffic
Scan SSL-encrypted traffic for viruses, worms, and Trojans, and block them at the secure web gateway
Prevent spyware from installing or communicating over SSL/TLS
Stop rogue applications (such as IM and P2P) that use SSL to subvert enterprise controls and security measures
Accelerate approved and safe SSL-encrypted traffic
Send a stream of decrypted traffic to third-party logging systems for analysis, archiving and forensics