iOS 15 arrived on 20 September 2021 and it can be set up on a numeral of older iPhones . But many owners of these older iPhones , including the first - generation iPhone SE , iPhone 6s , and even the iPhone X , could be inquire if the raw system of rules will consort well on their old chips .
In the yesteryear we ’ve heard iPhone users kick that their iPhones have slowed down after a major update like this , so this is a valid concern ( even if Apple usually finagle to address the military issue with further software updates ) .
Apple claims tosupport all these iPhones with the Io 15update , but it is no co-occurrence that the ship’s company restricts some functions to newer equipment ( iPhone XS and subsequently in this case ) . Apple has set aside some of the best feature for the newer iPhones for good ground – former iPhones are n’t capable of running them . Read : Many iOS 15 feature only work on newer iPhones
Hence owners of older iPhone handsets have a real quandary when it occur to the head of whether to update to the raw iPhone operating organisation . Not only is there a question of whether iOS 15 could slow down their iPhone , the few fresh feature that are in reality uncommitted for them may not be deserving the risk .
If you have an old iPhone you will no doubt be wonder if installing iOS 15 would be something you might regret later . We are here to help you find out .
iOS 14 vs iOS 15: Speed Tests
Last calendar week we put an iPhone 11 , an iPhone X and a first coevals iPhone SE to test . We instal Io 14.7.1 and restored from a private iCloud backup ( so that the test accounting would represent distinctive conditions , with open Safari tabs and accumulated rubbish gathered over the years , rather than a unfertile French telephone ) .
We made measurements in iOS 14.7.1 and then we installed iOS 15 Release Candidate on all three devices and ran the same exam . Here are our experiences .
Safari
Apple not only sour hard on the surface of Safari , it also meliorate the code in the background . In both of our trial run – Jetstream 2 and Basemark Web 3.0 – all three iPhones extend iOS 15 saw better musical score than when they were running iOS 14.7.1 .
As you may see from the chart below , in the Jetstream web browser app test the improvement was marginal for the two newer iPhones , but the one-time iPhone SE saw a pregnant improvement .
In the our Basemark trial all three iPhones under iOS 15 performed better .
CPU performance
You might cerebrate that CPU public presentation should continue the same on each iPhone , no matter of operating scheme , but Apple hold back improve drivers and these improvements ( or computer error ) can be reflected in carrying into action . For these run we used Geekbench to record singlecore and multicore score as well as Geekbench ML to game the performance of the bit in machine learning .
Note that the two onetime smartphones – iPhone X and iPhone SE – do not include the Neural Engine , which is responsible for such ML calculations from iPhone XS onwards .
We would have preferred to use the APSI Bench trial app , but that app is no longer compatible with the first - genesis iPhone SE .
There are no important difference in single - essence measurements on the new iPhones , only the iPhone SE sees any real benefit from iOS 15 .
The defective news is that with multi - core measuring the iPhone 11 really perform slightly worse under iOS 15 than it does on iOS 14.7.1 .
For ML measurements all three iPhones benefited from the update .
Graphics performance
For graphics performance , we scat two benchmark apps 3D Mark Wild Life and GFX Bench Metal on the three iPhones . For the test we downloaded a graphics - intensive app from the App Store , installed it on all three iPhones , set up the telling and Games Center , and restart . Before that , we course removed them from the app storage .
Amazing but genuine : the graphics performance deteriorated somewhat for all three iPhones . There is an outlier in the measure on the iPhone 11 Pro ( in GFX Bench Metal ) , but even with the measured start times of Marvel Future Revolution the newer gimmick was a bit slower when run iOS 15 .
These scores should be demand with a pinch of salt on the basis that we tested with the Gold Master , rather than the final version . Apple may have ironed out errors prior to the last update , and in subsequent variant . Hence we will measure this phenomenon again with iOS 15.1 or 15.2 .
Conclusion
Even with Old gadget such as the first - generation iPhone SE , iOS 15 can be safely installed . Safari gets faster and the overall public presentation is not slowed down by the late system .
As for why iOS 15 performs a picayune bad in graphics carrying into action we will have to wait for future updates to see if this is addressed .
This clause originally appeared onMacwelt . Translation by Karen Haslam .
