Slow burning speed using k3b

k3b only burns CDs at 8x (its my only option in burn speed). The device and the media supports 52x. Anyone knows whats the problem?
# cdrecord -checkdrive
Device was not specified. Trying to find an appropriate drive...
Detected CD-R drive: /dev/cdrw
Using /dev/cdrom of unknown capabilities
Device type : Removable CD-ROM
Version : 5
Response Format: 2
Capabilities :
Vendor_info : 'MATSHITA'
Identification : 'DVD-RAM SW-9587S'
Revision : 'PXQ9'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Using generic SCSI-3/mmc CD-R/CD-RW driver (mmc_cdr).
Driver flags : MMC-3 SWABAUDIO BURNFREE
Supported modes: TAO PACKET SAO

Having the same problem, since 7.7 and now 8. Have my library on an external hard drive and used to not have any problems. Took average of 5-6 minutes a CD, now 18 to 19 minutes. Could it be because of a problem with USB and my external? Seems like USB is causing a lot of problems in 8.

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