In one of the systems of fast boot, the hardware in the PC is initialized in PARALLEL rather than one device then the next. This works for most PCs but there are some PCs that must have this turned off.
I'm going to hit pause here since there are way too many web pages about prefetch.
For most folk, all this is just turned on or never tinkered with. On a nice PC with SSD I see power on to internet access times about 10 to 20 seconds. That's pretty fast.

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