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Slow DVD-R burning with growisofs under ide-cd

When burning a DVD-R with growisofs, the reported write speed is 4.00x,
but the measured speed is only 0.40x.  DMA is on and -20 nicing
growisofs and mkisofs has no effect.  Using ide-scsi, I can easily get
4.00x measured speed.  However, until ide-scsi stops causing kernel
panics, I'd like to avoid it.  My setup is as follows:

Linux Kernel  - 2.4.21 + bootsplash patch + updated lm-sensors, bttv,
and v4l2 + loopjari crypto
Processor     - Athlon XP 1.26Ghz
RAM	      - 1GB
DVD+-RW Drive - Vendor: PIONEER   Model: DVD-RW  DVR-106D  Rev: 1.07
DVD-R Media   - Some Generic brand labeled "HQ 1X-4X"

For the ide-scsi, the last thing in the log is always of the form:

[kernel] scsi : aborting command due to timeout : pid 555338, scsi0,
channel 0, id 0, lun 0 0x35 00 00 00 00 00 00 00 00 00

I can use sysrq to sync, remount, and boot successfully after the kernel

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