iPhone XS iPhone storage performance degradation overtime

[qyqgpower]

IPhone XS/XS Max storage speed 64 vs 256 vs 512

Can you please update your results of androbench test from app store. It measures internal memory speed and performance I'm interested especially in 256 vs 512 comparison. The reason is Samsung makes 512 memory chip and in their own devices (like Note 9 512gb version) they use ufs type of...

forums.macrumors.com

This was a thread from 2018 and as you can see the storage performance from those freshly released Xs was excellent, eg R=1600 W=700 for 256GB model.

And this is my iPhone Xs 256GB with 80GB+ free space after almost 3 years.

App name: PerformanceTest

I googled and didn’t find anything about how to restore the performance, or even any thread to discuss this issue, so can anybody shed some light?

 

[Shirasaki]

Fresh SSD has all of their "cells" brand new, so it is when they have best performance.
After a few years of use, some "cells" have degraded over time and have a harder time to read/write.
You can basically think of this as the ageing process of a human: young and strong, can do lots of stuff. Grows older and loses strength to do things that could've been done when still young.

 

[iterva]

This was a thread from 2018 and as you can see the storage performance from those freshly released Xs was excellent, eg R=1600 W=700 for 256GB model.

And this is my iPhone Xs 256GB with 80GB+ free space after almost 3 years.

Downloaded that app and ran it on my XS 256GB with 167GB free space. I got it sometime around April/May 2019. I got Read 523 and Write 498 and it runs just fine in day to day use.

As to the issue as you described it i have nothing to add since @Shirasaki has already provided a excellent answer to that.
In general i recommend friends/family to stay away from any kind of benchmark apps unless trying to track down an issue they might be having since these kind of apps mainly seems to result in most users having anxitety for no reason really

 

[hovscorpion12]

iPhone's do not use SSD's. They use flash storage.

 

[mprime_17]

iPhone's do not use SSD's. They use flash storage.

Both are nand.

Unless Apple is using very low-quality nand cells (I know they use TLC but that doesn't say much) or somehow iOS does a LOT of writing (even with sufficient free space), there shouldn't be any tangible degradation at this point.

On the other hand, Apple does use some space to create an SLC cache but I don't know if it's permanent or just when needed. Maaaaaaybe the first test was using that cache meanwhile your recent one doesn't.

 

[RoboWarriorSr]

iPhone's do not use SSD's. They use flash storage.

Since the iPhone 6s, Apple has been using custom SSD controller also used on their MacBook line up (the 2015 to 2019 models with no fan) and have been found to use NVMe flash storage.

iPhone 6s and iPhone 6s Plus Preliminary Results

www.anandtech.com

So yes, they are using laptop/desktop class storage for their iPhone and iPad line ups.