CD/DVD burning SLOW

Hi,
I have this problem with my Asus A6JC laptop. It's CD/DVD burner is really, really slow. I mean, it says it can write 24x CD speed (4234kb/s) but it usually does at about 10x using k3b. It says it can do 8x DVD (11080 kB/s) but its doing at about but it's at it's best at around 0.9x
I've found this information in k3b faq http://k3b.plainblack.com/faq, but it didn't help as I have DMA enabled (both according to hdparm and dmesg output).
If I run cdrecord dev=/dev/hdb -prcap I get all the nice information about the device capabilities. Check this out:
cdrecord dev=/dev/hdb -prcap
WARNING ! Cannot gain SYS_RAWIO capability !
: Operation not permitted
Cdrecord-Clone 2.01.01a06 (i686-pc-linux-gnu) Copyright (C) 1995-2006 Jg Schilling
NOTE: this is OSS DVD extensions for cdrtools and thus may have bugs
related to DVD issues that are not present in the original cdrtools. For
more information see http://crashrecovery.org/oss-dvd.html. The original
cdrtools author should not be bothered with problems in this version.
cdrecord: Warning: Running on Linux-2.6.17-ARCH
cdrecord: There are unsettled issues with Linux-2.5 and newer.
cdrecord: If you have unexpected problems, please try Linux-2.4 or Solaris.
WARNING ! Cannot gain SYS_RAWIO capability !
: Operation not permitted
scsidev: '/dev/hdb'
devname: '/dev/hdb'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
WARNING ! Cannot gain SYS_RAWIO capability !
: Operation not permitted
Using libscg version 'schily-0.8'.
Device type : Removable CD-ROM
Version : 0
Response Format: 2
Capabilities :
Vendor_info : 'HL-DT-ST'
Identifikation : 'DVDRAM GMA-4082N'
Revision : 'HJ02'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Drive capabilities, per MMC-3 page 2A:
Does read CD-R media
Does write CD-R media
Does read CD-RW media
Does write CD-RW media
Does read DVD-ROM media
Does read DVD-R media
Does write DVD-R media
Does read DVD-RAM media
Does write DVD-RAM media
Does support test writing
Does read Mode 2 Form 1 blocks
Does read Mode 2 Form 2 blocks
Does read digital audio blocks
Does restart non-streamed digital audio reads accurately
Does support Buffer-Underrun-Free recording
Does read multi-session CDs
Does read fixed-packet CD media using Method 2
Does not read CD bar code
Does not read R-W subcode information
Does read raw P-W subcode data from lead in
Does return CD media catalog number
Does return CD ISRC information
Does support C2 error pointers
Does not deliver composite A/V data
Does play audio CDs
Number of volume control levels: 256
Does support individual volume control setting for each channel
Does support independent mute setting for each channel
Does not support digital output on port 1
Does not support digital output on port 2
Loading mechanism type: tray
Does support ejection of CD via START/STOP command
Does not lock media on power up via prevent jumper
Does allow media to be locked in the drive via PREVENT/ALLOW command
Is currently in a media-locked state
Does not support changing side of disk
Does not have load-empty-slot-in-changer feature
Does not support Individual Disk Present feature
Maximum read speed: 11080 kB/s (CD 62x, DVD 8x)
Current read speed: 11080 kB/s (CD 62x, DVD 8x)
Maximum write speed: 11080 kB/s (CD 62x, DVD 8x)
Current write speed: 11080 kB/s (CD 62x, DVD 8x)
Rotational control selected: CLV/PCAV
Buffer size in KB: 2048
Copy management revision supported: 1
Number of supported write speeds: 2
Write speed # 0: 11080 kB/s CLV/PCAV (CD 62x, DVD 8x)
Write speed # 1: 5540 kB/s CLV/PCAV (CD 31x, DVD 4x)
Supported CD-RW media types according to MMC-4 feature 0x37:
Does write multi speed CD-RW media
Does write high speed CD-RW media
Does write ultra high speed CD-RW media
Does write ultra high speed+ CD-RW media
(note that this is with a Sony DVD-R 8x disc inserted, so CD values are a bit misleading)
I'm actually worried worried about "WARNING ! Cannot gain SYS_RAWIO capability !". I haven't tried burning in Windows, since I haven't installed it yet Anyone could help, please?

I have the same problem, plus i can assert that EVEN the usb burner il slow and the system seems slowed itself (like as having dma disabled).

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