It was always slow to display help from xsibackup by using --help parameter, but the greater the versions are, the longer the time to display help is.
With 10.0.1, each time i launch xsibackup --help, it takes between 60 and 70 seconds to display.
Looking quickly at the code, i can't understand why it's been so slow...
This is due to some variables substitution. This hasn't really changed since long ago, so it should not take more time as versions grow. It probably has to do with the load on your server at every particular moment.
In any case we'll change the way it's displayed to make it faster.