I installed the BIOS from a flash drive at the urging of Dell Support. It seems to have installed correctly this time. Last BIOS start up time was 7.9 seconds.
So I tried installing BIOS version 1.0.12 twice and both times my last BIOS start up time went from 7.8 sec to 23 sec. I reverted to 1.0.10 and all is good again. Anyone else have problems with the new optional BIOS update?
XPS 8950, BIOS 1.0.12, slow boot