Automated subscribe/from/record setup script help

["David J. Weller-Fahy" <dave-lists-mutt-users@xxxxxxxxxxxxxxx>]

I'm currently using a script to set my folder-hooks and subscribe
statements for mailing lists.

Here's the script:
#v+
#!/bin/sh
# $HOME/.muttrc.mailinglists
cd "$HOME"
MDIRS=`echo Maildir/.lists.*`
for DIR in $MDIRS
do
        unset LIST
        FILE=`echo "$DIR"/cur/* |sed 's/.\+ //'`
        for PAT in "^delivered-to: mailing list " "^x-beenthere: " 
"^list-unsubscribe: <mailto:"; "^sender: "
        do
                LIST=${LIST:=`sed -n "/$PAT/Ip" ${FILE}`}
        done
        if [ "$LIST" != "" ]
        then
                MLST=`echo "$LIST" |sed -r 's/.+(<)?.+[: ](owner-)?//; 
s/-request(@.+)\?.+/\1/'`
                echo "subscribe $MLST"
        fi

        DIR=`echo "$DIR" | sed 's/.\+\/\.//'`
        echo "folder-hook +$DIR set from=dave-`echo ${DIR} |sed 
's/\./-/g'`@weller-fahy.com"
        echo "folder-hook +$DIR set record=imaps://imaps/INBOX/$DIR"
done
#v-

When I start mutt there's a significant lag (mostly because I couldn't
figure out how to select only one file from a given maildir).  Can
anyone suggest a better (faster, more efficient) way to achieve the same
results?

Regards,
-- 
dave [ please don't CC me ]