Pretty common tip but worth repeating – be surprised how many seconds you can shave off by doing it.
i) On the server you administer your GPO’s run gpmc.msc
ii) Under group policy objects on the left-hand pane right-click on the group policy you want to amend and choose properties
iii) Right-click on the group policy on the left-hand pane and choose properties
iv) Click the tick box beside the appropriate section – whether it be Disable computer configuration settings or Disable user configuration settings and click ok to disable that particular section