I have an update. This might help somebody who are still facing slow
boot start up.
Once you have booted your XPe, go to services and look for Distributed
Transaction Coordinator.
Select that service and change the Logon type to System and Disable
the Service.
Try re booting the machine after disbaling the service and see does it
make any changes in your booting speed.
For some reasons, this service is not getting started and in registry
path is not mentioned properly. even if you give correct path, service
is not starting.
Try this setting and let me know.
Magesh