Enabling BitLocker makes BIOS POST very slow

With BitLocker enabled using the TPM of my Thinkpad X61T the BIOS POST time increases for 1 to 17 sec.
After the BIOS POST Win7 takes 15 Sec to start. So enabling BitLocker doubles my boot time.
Is this long boot time the expected behaviour with BitLocker and Thinkpads, or can it be omitted?
The positive: Windows itself does not feel slower with BitLocker encryption. HDTUNE does not measure a slowdown.
X61T, Bios 1.2.2, Window 7 Beta x64, 1400x1050, 4GB RAM, 1GB Turbo Memory, Intel X25-M SSD

Updating to BIOS 1.23 released 2009/04/27 did not help.
Installing Intel Matrix Storage driver 8.9.2.1002 released 2009/10/02 (offerd by the Win7 compatible version of System Update) did not help.
Is Lenovo planning to fix this problem?
X61T, Bios 1.2.3, Window 7 Final, 1400x1050, 4GB RAM, 1GB Turbo Memory (disabled), Intel X25-M SSD

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http://support.apple.com/kb/ht1430
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Well I have been tinkering with this computer.
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> I try to make popup dialog box by setting my subprogram with
>
> Viproperties-->Window Apperance -->dialog.
>
> and set my subprogram (which place into main program)with
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>
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>
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bios version?
Quote
16Gb GSKILL RAM
how many sticks?
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Quote
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Enabling BitLocker makes BIOS POST very slow

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