Hi MikeTV,
As you understand being a Windows based system it is natural to take a couple of minutes from cold boot to be operational:it loads the Windows OS, The OAS programm which in turns loads the samples to RAM nad then the VST instruments ( if any)
Before a live perfomance you can use this time to setup other things ( mike stand,cables).To avoid having this in the middle of a perfomance, I always use a small UPS /Surge protector ( as with all PCs) to avoid restarts due to power failure/problems.