I have got an iPhone 6S on October of 2015.
Sometime in 2016, I downloaded Geekbench 3, to benchmark the device.
My baseline results are: (5 runs)
Single: ~2500 (2450-2550) Multi: ~4400
Now, I feel like my iPhone is becoming slower, so I did the benchmark again. (11 months later)
My new results are: (5 runs)
Single: ~1500 (1200-1800) Multi: ~2100
And it seems that it is somewhat dependent on the battery percentage (low battery => low result. but even 100% battery is ~1700)
I understand these are synthetic benchmarks, and are not fully representing the device's performance, but it seems odd, and I want to know if my device is defective? Do I have a case for a phone replacement? Or, am I reading too much into it, and devices just decay over time?
Note: I'm not sure if this is relevant, but my device is part of the apple recall for battery replacement, but because the apple re-seller in my country does not supply phone replacement, I did not change it.