Renicing synology nfsd so it has priority over other services

We needed nfs to have priority over other services on a synology DS509+. To do this we reniced the nfsd process. Synologies are basically just linux boxes. So enable ssh on the synology and ssh to it (ssh synology -lroot) use your normal admin password for the password. Then edit /usr/syno/etc/rc.d/S83nfsd.sh. Where it currently reads:

/sbin/portmap
/usr/sbin/nfsd
/usr/sbin/mountd -p 892
;;
stop)

change it to read:

/usr/sbin/nfsd
/usr/sbin/mountd -p 892
renice -10 `pidof nfsd`

;;
stop)