Optical Drive Pioneer DVR-K16M is very slow, why?

[Prokurator]

Hello!
In my vaio (model VGN-FE11MR) has installed this model of optical drive. In the specification of my notebook has been written
http://www.vaio-link.com/specifications/specifications.asp?l=en

CD-ROM : 24 x Speed
CD-R : 24 x Speed
CD-RW : 10 x Speed
DVD-ROM : 8 x Speed
DVD +R : 8 x Speed
DVD +RW 4 x Speed
DVD -R : 8 x Speed
DVD -RW : 4 x Speed
DVD Dual Layer : 2.4 x Speed

But real I have thees speeds:

CD-ROM : 24 x Speed
CD-R : 24 x Speed
CD-RW : 10 x Speed
DVD-ROM : 1 x Speed
DVD +R : 0.75 x Speed
DVD +RW 0.75 x Speed
DVD -R : 0.75 x Speed
DVD -RW : 0.75 x Speed
DVD Dual Layer : no information

The firmfare version 1.00. On site of Sony support and Pioneer no firmwares for this drive. Pleese, help me.

Sorry for my bad English.

[Prokurator]

In addition, I tried most popular programs for burning disks. I think that problem in driver or firmware of device.