restore of file system into USB key terrible slow

[Matthew Dillon]

    I've had good luck mounting UFS -o async on USB keys for the purposes
    of doing bulk operations.  It still isn't the fastest thing in the
    world but it seems fast enough.

    Softupdates does a *lot* of tiny I/O's, try disabling it (I think
    mounting async disables softupdates automatically but I'm not sure).

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>