The CAN field bus based control system interface to the BESSY power supplies was designed with emphasis on robustness, long-term stability, reproduceability and precision, relying on the basic idea that intrinsic beam stability is achievable at any required level. In preparation for the first phase of a fast orbit feedback system installation, a number of steps at different levels have been taken to enable the existing interface for fast, parallel, synchronized distribution of set point values to corrector power supplies. The design goal was achieving the maximum update rate and a minimum jitter, without major and/or expensive changes to the control system design or hardware. The paper discusses the shortcomings found, the measures taken, and the achievements made.