iPhone 6S CPU Score Halved Over A Year

[Update 2017-12-23]: As it turns out, Apple is actually intentionally slowing down iPhones as their batteries get older (link is non-ssl). This would explain my results, as I haven’t replaced my battery since getting it.

The performance degradation is still quite significant, and still not-becoming of a device that I own. I think I should be the one making the decision of weather to slow down my device or not, not Apple.

The fact that they didn’t even say they were doing this until now just rubs salt into the wound. What other Apple products do they do this to?


[Update 2018-06-27]: Another update on this, when the iOS update was released to show the battery degradation, mine was at around 83%. This doesn't explain the results shown below. Either my original theory was true, or Apple is under-reporting the battery degradation. Take from that what you will.


So apparently I purchased GeekBench some time ago for whatever reason, and I found it in one of my phone’s app folders just this morning.

I gave it a look and found some of my older CPU tests from early last year. Looked pretty good! My phone was about as fast as the average 6S - as one would expect.

However, what shocked me is when I ran a new test. The scores for both single and multi-core had almost halved.

Surely, there’s no way that this is by accident. No way would an engineer think that an update to a fairly new phone that nearly halved it’s performance is a good update.

My first thought when I discovered this was to check if the Geekbench scoring system had changed. A quick search led me to find that, yes, that was the case, but only with Geekbench version 4.1. I used version 3. The major versions are standalone. There should have been no difference.

The only reasons I can think of for there being any difference over time is: either the CPU is being throttled, or Apple was cheating the benchmarks around release - which may not be that outlandish, considering most Android manufaturers do this.

Versions and model

If you’re looking to reproduce:
  • Geekbench: v3.4.1 for iOS AArch64
  • iOS: 9.3.3 vs 11.0.3
  • Model (ID): iPhone 6S (iPhone8,1)
  • Motherboard: N71mAP
  • Processor (ID): Apple A9 @ 1.85 GHz dual (ARM)
  • L1 / L2 / L3 caches: 64KB / 3 MB / 0 B
  • Memory: 1.96 GB

Invalid Active Developer Path after Updating MacOS

I updated to the latest version of MacOS (High Sierra), which is really great. Nothing I used really changed but eh.

The only thing that did change was my ability to use some command line tools, for instance gcc and make stopped working. Originally, I thought it was because I uninstalled Xcode, but after re-installing I still didn’t have any luck.


A quick search led to me to this Stack Overflow article, which simply suggested to run the following command in the terminal:

xcode-select --install

According to the top response, the issue is that you have to explicitly accept the license agreement, for whatever reason it doesn’t ask you to agree when you install Xcode.

Get used to typing this in every time you upgrade your Mac, because it looks like this happens every update.


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