Has anyone tried the new Fast utility?

I just don't eat for a bit.

Bitflipper, I won't try it either for that reason.  I was just surprised to see testimonial quotes (fake?) having to do with music software performing better so I thought perhaps someone here had tried it.

I agree. Reading between the lines, I think they are messing with scheduling priorities. That's not always a good idea.
 
The scheduling algorithm for any O/S is a finely-crafted piece of code that's been refined over the past 70 years, and circumventing it isn't something one should take on lightly. Of course, it has to be generic and won't always know what's most important to YOU. Conversely, though, you don't know what's most important to the O/S, either.
 
For example, it was once common practice to raise the priority of the DAW to eke out a few more CPU cycles between audio buffer dumps. But that simplistic approach is no longer recommended. A scheduling optimizer can't know, for example, about the primary application's interdependence with external processes that support it.
 
So yeh, it might make a spreadsheet load faster. But really, are we so impatient that waiting an extra second to display a Word document is going to ruin our day?

Thanks for your 2nd post, RSMCGuitar.  You are correct, not only is the first paragraph designed to muddle, but the rest of the text isn't so great either.  What caught my attention were the videos showing increased speed.  Now, that could be completely faked.
 
I tend to think that most computer users of a DAW know to limit whatever else is being done by the computer.  I also can't count the number of posts I've answered by suggesting DPC Latency Checker or Latency Monitor.
 
 

This is also likely to work less well with good software, like Sonar. The only case where messing with OS scheduling could help is software that doesn't know how the OS schedules and messes things up. For example there have been games that bomb on the new Ryzen processors because they have so many virtual cores exposed the game doesn't know what to do. So you have to disable hyperthreading to make them work. Ya well that is not a problem with the chip, that is a problem with the software. It should be happy with any number of cores and not blow up.
 
Sonar has a long history of really solid and tight Windows development so the chances are that they properly write their program to use the Windows scheduler and run as fast as possible with things as they are supposed to be.