Exit script immediately after requesting the restart to re-enable overclocking. This will postpone the installation notification until after the reboot.
Move some operations until just before they are needed. This should make the reboot to re-enable overclocking start slightly faster after the restart.
Do installation notification before starting the build check timer.
Do build check every 3 hours instead of 4.
Changed xbmcnightlybuilds server back to openelec.xbmcnightlybuilds.com