Memory Remap Feature causes slow boot in Vista 64bit

I got a new computer with a P5B-VM motherboard (Intel G965 chipset) and 4GB
of Ram (2 x Corsair Twin2x2048-6400) and GeForce 8800GTX (with 768MB).

When I booted the pc for the first time the POST screen only showed 2815MB
and so did my windows Vista 64 bit. I searched the internet and found this
article: http://support.microsoft.com/kb/929605/en-us. So, I enabled the
"Memory Remap Feature" in my bios and now the POST screen showed 4GB and so
did Vista for a few seconds, ... then the pc rebooted. I looked on the Asus
site and saw there was a bios update (606) for this problem (my current bios
was version 307). I downloaded the latest bios (613) and updated the bios.
Now the pc didn't reboot anymore but the Vista boot took a long time (5
minutes or so). First I thought it was windows updating stuff because i
upgraded the bios, but the problem stayed: if i enable the remapping feature
it boots slow, if i disable the feature it boots fast.

I looked at the performance information in the event log and found this:

EventData
BootTsVersion 2
BootStartTime 2007-04-15T10:57:47.030Z
BootEndTime 2007-04-15T11:03:00.200Z
SystemBootInstance 19
UserBootInstance 18
BootTime 294420
MainPathBootTime 222120
BootKernelInitTime 51
BootDriverInitTime 8034
BootDevicesInitTime 103213
BootPrefetchInitTime 0
BootPrefetchBytes 0
BootAutoChkTime 0
BootSmssInitTime 12773
BootCriticalServicesInitTime 5629
BootUserProfileProcessingTime 2458
BootMachineProfileProcessingTime 837
BootExplorerInitTime 23033
BootNumStartupApps 5
BootPostBootTime 72300
BootIsRebootAfterInstall false
BootRootCauseStepImprovementBits 0
BootRootCauseGradualImprovementBits 0
BootRootCauseStepDegradationBits 0
BootRootCauseGradualDegradationBits 1024
BootIsDegradation false
BootIsStepDegradation false
BootIsGradualDegradation false
BootImprovementDelta 0
BootDegradationDelta 0
BootIsRootCauseIdentified true

Does anyone have any ideas ?