Unlike some others, who seem to be slinging it against the wall and making utterly ridiculous comments, it's call an educated guess; or even an opinion.
We're waiting for your edumacated opinion. 
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Other Apple is slowing down older iPhones based on battery wear level [MERGED]
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We're waiting for your edumacated opinion. 
Step away from the tin foil hat.
My rMBP had a faulty battery within warranty and there was no discernible slowdown before the sudden power down issues manifested. The CPU runs speedstep and turbo boost so doesn't run at a fixed clock rate. It varies based on load, number of cores used, power source and CPU temperature.
If you want to keep an eye on it download the Intel Power Gadget.
Unlike some others, who seem to be slinging it against the wall and making utterly ridiculous comments, it's call an educated guess; or even an opinion.
My edumacated opinion says it's rubbish.
64-bit registers don't increase the power usage. A 64-bit CPU will perform certain complex operations quicker which makes it more energy efficient than a 32-bit CPU because it can get the jobs completed faster and then drop to a reduced power state.
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Upgrade the device every year or dont update the software on your device. Those are the only options in iOS if you dont want a compromised phoneUpgrade every year to ensure top performance.
You said you will do anything.
Very difficult indeed and certainly not my area of expertise. I suppose I had been wrong when I made the assumption that the talented hardware engineering teams at Apple worked this one out together with the similarly talented iOS team.
Yes, they haven't intentionally slowed down the 8 or X yet. But they did say they plan on continuing the same "feature" in the future.
You gotta be kidding me, they're straight up saying we will continue to intentionally slow down devices...
And for the MacBook Pro he's asking about?
I'd be more worried about the keyboards than performance on new MBPs.
Bam, that would be the perfect answer to all this.
But that will only be good for consumers so they probably wont go for it.
They rather sell brand new iphones than replace warn out batteries.
It will arrive on the 8 and X just in time for the 2018 iPhones to be released.
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This is nothing but making a fool of us customers by these behemoth companies by saying it's fixable by software. They are just trying to save costs on a new component by implementing this toggle and as a bonus also get more revenue on newer phones. Even Google did this on the Pixel. They claimed the burn in and the colours were fixable by software and it wasn't a defective screen. You know what they really did? They reduced the max brightness of the screen and in the process of fixing colours made the problem of black crush at low brightness even worse.
They did work it out, you are absolutely correct. This strategy has been in the making for a while since iOS 10.2.1, seemingly fully implemented in iOS 11.2.
Not working this issue out means more unhappy customers (IMO) and dead phones.
At least now we can rule out iOS updates speeding up the phone nonsense from hereon in.
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You feeel it to be reasonable for a $1200 phone to throttle after just 1 year?
Same here.
And I dont want Apple to slow down. My iPhone 7 Plus runs nice and smooth on ios 10 and battery is great.
Its at 93% battery capacity and CPU tests report that its on full un-throttled speed.
Why would I want to go to ios 11 and feel like Im using an iPhone 3G again
The kind of nonsense that you yourself talked about and experienced with the iOS 10 upgrade over iOS 9?
Can you prove that it happened? But to answer your question if it’s a choice between dead or slow, slow wins. No matter what phone or cost.
We haven’t ruled out that iOS optimization’s will result in better performance. You ruled it out, but it’s on the table.
Upgrade every year to ensure top performance.
You said you will do anything.
Ahhhh this is becoming ludicrous.
Maybe I need to get a Dell. I had windows before Mac. Mac is much better imo but I’m not buying a new rMBP every year.
At least people with dead phones would know what the issue with the phone is.
Instead people assume it's just the phone getting slow with iOS updates and figure the only solution is to buy a new one. Even if they got it checked by Apple techs, they'd report a "Healthy" battery not in need of change.
So who really benefits from this?
Bro, they are already starting throttling iPhone 7 models with iOS 11.2.1 and those are still over 90% battery capacity.
And never had any issues with shutting down due to battery issues.
This battery thing is just an excuse, they are starting to slow down iphones about a year later with each iOS update.
This is not a feature to help you or me. Its a scam to put more money in their pockets.
Wake up and smell the coffee my friend
My edumacated opinion says it's rubbish.
64-bit registers don't increase the power usage. A 64-bit CPU will perform certain complex operations quicker which makes it more energy efficient than a 32-bit CPU because it can get the jobs completed faster and then drop to a reduced power state.
Right on! The determining factor to how much energy a device will consume is almost always in software (i.e. running good code on slower hardware can, and most often, do, beat running poorly written code on fast cpu); the processor will draw whatever its power requirement given each process. 64bit/32bit refer to the available registers and has ZERO relation to power consumption, saying 64bit uses more energy is like saying 16 lane high way uses more energy than 2-lane country road.
Rubbish indeed!
None of what I said in that discussion had anything to do with that, "bro".Bro, they are already starting throttling iPhone 7 models with iOS 11.2.1 and those are still over 90% battery capacity.
And never had any issues with shutting down due to battery issues.
This battery thing is just an excuse, they are starting to slow down iphones about a year later with each iOS update.
This is not a feature to help you or me. Its a scam to put more money in their pockets.
Wake up and smell the coffee my friend