Rebuilding the WIM is slower, but will save a little bit of space that would
otherwise be left as a hole in the WIM. Even more space will be saved if the
read-write mount resulted in streams being deleted from the WIM. Also see
-\fB@IMAGEX_PROGNAME@ optimize\fR. Has no effect if the mount is read-only or if
-\fB--commit\fR was not specified.
+.TP
+\fB--lazy\fR
+Pass the \fB-z\fR option to \fBfusermount\fR, which performs a "lazy" unmount
+where the filesystem is detached immediately even if it is still busy. However,
+even with this option, \fB@IMAGEX_PROGNAME@ unmount\fR still waits for the
+filesystem to become unbusy; \fB--lazy\fR will only stop the unmount from
+immediately failing.
.SH IMPLEMENTATION DETAILS
Since a WIM is an archive and not a filesystem, \fB@IMAGEX_PROGNAME@ mountrw\fR creates a
temporary staging directory to contain files that are created or modified. This