I have two A2K with Blizzard2060 and CV64/3D, I used to use CGX with them but went over to P96 because I have it on my Prometheus-machines and felt that the picture were much better and crispier with P96.
The only thing I can remember that would speed up CGX was the overclocking feature but I never did that because I hadn't got a proper cooler for it. I recommend a cooler on the board with original speed anyway, it´s getting pretty hot.
I used "Cyber56KHz" to get better sound and perhaps it did something with the graphics too, don't remember.
