Once you follow these guidelines, it will be critical to test your entire gig (i.e. every song, every Rackspace in Gig Performer) to make sure that these optimizations have not broken anything.
Please note that you should not perform these optimizations right before your gig, or a couple of days before your gig – we strongly recommend to optimize your PC at least a few weeks before your gig, so you have plenty of time to sort out any issues or restore from your backup if something breaks.
If you are on tour, it is crucial to not perform any updates, or optimizations. You should keep your working PC configuration until your tour is finished.
You do not want to think about your PC while on tour, you just expect it to work. When you get to a show, you turn on your computer and perform - you do not even want to think about optimizations or any other computer-related stuff.