General Growth Properties Inc., Chicago, dropped the Janus Worldwide fund and replaced it with the Oppenheimer Global fund, said a plan official who did not wish to be identified. Investment committee members dropped the Janus fund for performance, the official said. CIGNA, bundled provider to the $123 million 401(k) plan, assisted. Shelley Peterson, Janus spokeswoman, did not respond to a request for comment by press time. The plan offers 16 investment options.