I don't know what really happen this time, I used Clone DVD for over 3 years without complain but after the upgrade to burn a DVD take up to 3 hours, before it did in max of 40 minutes.
1. Ensure DMA is enabled for your drives 2. If the original disc is scratched or poorly pressed read times will increase no matter what 3. Try a faster burn speed (but don't burn at 16x)