Firstly, it might help if you state your drive make and model and the firmware you are using, and DVD type you are ripping.
Anyway, riplock is more like 2X-3X, that's all, faster ripping speeds means there might not be a riplock on your drive.
20X is faster than I can imagine. Most readers are up to 16X, so 20X is unbelieveable. Officially DVD-Video speed is maxed out at ~10X, and maybe some drives can rip a little faster.