Only annoying thing about sim rate, at least in GA, is that it makes for a very bumpy looking flight. It doesn’t feel like you’re “just flying faster”, it definitely feels like what it is, a sped up simulation.
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Not if you calm the air down. Then when you’re done with x4 or w/e, turn live back on 
Yeh I guess that’s an option. Still breaks immersion, but it can’t all be perfect.
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I was working on gathering some performance benchmarks yesterday. I reran the same flightplan several times, and I did find 8X useful for speeding up one fairly long leg over water so I could get to a waypoint that would take me over a city.
Even an old dog like me can learn a new trick!
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We all enjoy the game in our own way but I have to admit I am curious about this sim-rate acceleration thing too! I never use it because for me it would break immersion.
I do very short real world airliner flights so I guess thats why I haven’t seen the need to use the sim rate acceleration.
Heres one, a 30 minute A320neo hop 
These are challenging as you gotta be way way ahead of the plane. You’ve hardly taken off and then have to prepare for the approach and landing.
I agree that we all enjoy the game in our own way.
But, I just don’t have the patience, I guess.
But, I fly IFR/ILS mostly. (with the Flight Plan already setup)
Once at cruise altitude, I don’t feel much immersion.
Just waiting for the ILS Localizer and Glide Slope to go active.
So, I’ll bump up the Sim Rate few clicks.
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I also fly IFR, and love ultra long haul flights.
For me, not using sim rate acceleration actually helps to improve inmersion.
Right now I´m flying the Headwind A330-900 NEO on a simulated Iberia 6833 flight from Madrid to Santiago de Chile.
I took off from Barajas 11 hours ago, a bit before the actual A350 IB6833 did (I wish we had an A350 in the sim, but we don´t and won´t for the foreseeable future). I also took off a bit after a Latam B787-8 did as L705 for the same route.
The fact that I can follow those aircraft in FlightRadar24 (I have flown both in real life several times), and I can see my own A330 in-sim and in the Navigraph charts, just between both real planes for 13 hours, cruising essentially at the same speed and altitude, going through a similar route, is nothing short of amazing.
Watching the full moon set in the horizon taking way longer than usual because of my westernly course, and that sunrise taking forever for the same reason, is overwelming.
And the best part comes now. As it dawns, I can see the magnificent Andes cordillera and identify lots of mountains and some of the most important places in my life. Chile and the Atacama desert is Disneyland for those of us interested in Astronomy. In fact, the sim accurately showing the southern cross, coal-sack nebula, and the centaurus-carena milky way gaining altitude as you head south, is just unbelievable (IB6833 took me to Chile years ago for my first sights of the souther sky from Cerro Tololo / Pachón / Las Campanas and La Silla observatories, later L705 did the same for Cerro Paranal / Armazones / Chajnantor).
In a couple of hours (real time, of course) I will follow L705 landing in Santiago. After I do the same in sim, the real IB6833 will follow us in real life. If I get lucky, FSLTL will inject that wonderful A350 in the sim, and it will park next to my Headwind A330 Neo. It´s happened before, and for someone who comes from Flight Simulator 98, it´s just unbelieavable that we have come this far…
That´s inmersion for me. And it happens in real time. I want to enjoy it second by second.
Best regards.
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I am curious about fuel consumption and sim rate. I know that PMDG has implemented matched fuel consumption with sim rate, but what about others.
If I took the LVFR (i know!) A330-900 on an 8 hour flight increased to sim rate x2, would the fuel consumption match the simrate or would I land heavy on fuel?
The entire thing speeds up. Time goes faster, fuel burns faster etc.