HP Compaq 8200 Elite SFF slow reboot time in legacy Bios Mode with 02.29 bios

Hi,

We have 700 HP Compaq 8200 Elite Sff in my company.

We are deploying Windows 10 Enterprise 64 bits edition.

During deployment i update bios to the latest release available 02.29

http://h20565.www2.hp.com/hpsc/swd/public/detail?sp4ts.oid=5037932&swItemId=vc_165224_1&swEnvOid=4059

I deploy Windows 10 with SCCM and PXE boot.

When i boot in PXE, WinPE start in legacy mode (no UEFI) and i install Windows 10 in BIOS mode.

Everything setup fine except restart time that take at least 2 minutes !

Every time i have to restart Windows it is very long.

If i shutdown Windows and start again it is quick

If i restart Windows it is very slow.

If i install Windows 10 with SCCM but without PXE but with USB stick, Windows setup is in UEFI and i don't have the restart problem.

Can anyone help me to fix this issue in legacy bios mode ?

Regards