Migrating Files from Novell to Microsoft is slow

Hi all,
Migrating several large volumes from Novell to Microsoft and I've run into
some issues applying security rights. We have a script that turns the
volumes_trustee file into a set of icacls.exe commands. Trouble is when
setting a permissions on a folder that is high up in a directory tree that
is
very deep the permissions take a VERY long time to apply.

This is most obvious when setting permissions on a root level folder such as
D:\Shared. Adding a single ACE on a root level folder is taking several
hours
to complete.

This is too slow. Are there any solutions to this issue?

Thanks,
Jacob