Depends on how extreme the throttling goes. I've seen some who get throttled all the way down to 600 GB4 scores on the iPhone 6 and 6s. That would be similar to running an iPhone 5 on iOS 11 except even slower.People are getting this throttling thing entirely wrong.
Throttling basically reduces your phone's CPUs peak output. The thing is, no phone runs at 100% CPU 24x7. Almost 80% of time it's going to be running underclocked because texting or snapchat or facebook or Safari doesn't require the full power of the CPU. Throttled phone or not, this tasks would not be affected because CPU is never running at the full speed. It's the intensive apps like photo editing, video editing, gaming that would be affected because the CPU is "capped".
It's like driving a car, you don't utilize your cars 100% potential. You go pedal to the metal like once in a blue moon. So if that your car's engine RPM is capped at 5k, your normal driving which includes driving in 1500-2500 RPM range is not going to be affected.
That said, agree, current throttled performance of iPhone 7 units is actually still pretty good. 2600 is around (unthrottled) iPhone 6s speed and is actually still faster than the iPad Air 2. If it were my phone, I'd just wait until it gets worse (~1500 single core) or December 2018 whichever comes first before I get the battery replaced at $29.
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