I'm not really sure how to answer your question about disabling it or not. Fastaccess also looks to be a component of Sensible Vision.
It's a program i am not familiar with. i know what it does, but i don't know enough about it to know if it does it WELL lol if you know what I mean. To me, an old fart, it falls into the category of programs that look cool, may be cool, but I don't want on my computer at this point without more knowledge of what it does and how it does it. Logging in is not a big deal to me. I don't have state secrets so if someone hacks my login somewhere, it's no big deal to me. I'm not sure how well a face recognition program on a home computer would work. How many computer resources is it hogging? I couldn't see with a quick perusal of their site.
If you bought the program then you obviously want it (or wanted it) but if it came pre-installed on your computer, you may not care if it's there or not. I really don't have time to research it right now even though it intrigues me and I want to lol. Quick advise (which means I could be so wrong it's not funny) is that if you are having problems with computer speed and are malware free, then this is what is slowing you down, well unless you have Norton or Symantec AV. If you have Norton, THAT would be the first thing I would get rid of to speed things up. I can't see how a program that does all this is supposed to do can be anything but a resource hog. Since it can detect when you are away from your computer and shut down programs, it HAS to be continuously scanning and comparing. I would be interested in seeing what other processes it takes to run. I hope i have helped you out rather than confused you more .
Just out of curiosity, did it come pre-installed or did you buy it/ if you did buy it, then why? I ask why just seeking information, not in an accusatory, or judgmental way, I really am curious about this thing. Like I said, it looks really cool if it works and works without hogging resources. I'm curious about what would motivate someone to get this. LOL I won't be "offended" if you tell me it's none of my damned business. Perpetually curious, (and as a part time reporter) I get that response often.