QSI SBW-241 Reading Speed

I am using a Sony notebook with this combo drive as the dvd reader however it is very slow, about 3x max. Firmware version is VS03 and DMA is turned on. Is there a way to increase the speed on this?? Thank you in advance!!!

All I can think of is either the drive does not like the DVD’s your using or the firmwares gone funny.
If you want to try a new firmware I found patched RPC-1 files here.