Yes, I have the same problem
I formatted the HD and reinstalled 98SE.
Installed the 4 PCI cards (which includes Promise ATA/100 and 3Com NIC and TB sound card and a firewire card) separately.
The sound card went in last and that really slowed the boot up. I get a black screen for at least 30 seconds alone and plus there is the other time devoted to sdram check and Microsoft 98 advertisement.
How can I reduce the time here?
The order of the PCI cards was via Dell's recommendation.