Is it laggy or not? Experience with iPhone 4S, 5, 5S, and iPad 2 under iOS 9

The closed nature of the system allows old antiques such as iPhone 4S and iPad 2 to be upgraded to iOS 9. Android users can only envy them in this regard. The question now is, for a mobile phone with hardware configuration that is 4 years behind, is it really useful to upgrade to iOS 9?

It is worth mentioning that after the release of iOS 9 today, many users of older models such as iPhone 5 and 5S complained that they felt a bit stuck when upgrading to the new system. What is going on?

Foreign media has now conducted actual tests on the performance of iPhone 4S and iPad 2 after upgrading to iOS 9, and also tested whether the battery life of older iPhones and iPads has been improved. In order to highlight the effect, all devices will also undergo the same test under the iOS 8.4.1 system.

Let's first talk about the performance of iPhone 4S and iPad 2 under iOS 8.4.1 and iOS 9. When opening Safari, Camera, Mail, Calendar, Messages and other applications, they are slower when running iOS 9 than iOS 8.4.1, and the time taken to restart is also longer in iOS 9 than in iOS 8.4.1, but these time delays are not noticeable in your daily use, and the overall process is still smooth. Apple has not stopped optimizing old devices.

Does iOS 9 really improve battery life? From the comparison of battery life tests of iPhone 4S, 5, 5S, 6, 6 Plus, iPad 2, 4, Air 2, mini, mini 2 under iOS 8.4.1 and iOS 9.0, most of them have a small improvement, but the improvement of iPhone 6 Plus is obvious.

In the SunSpider test, the performance of the older device under iOS 9 is basically at the same level as iOS 8.4.1, and the slight difference between them is also imperceptible during use.

Is it necessary to upgrade old devices like iPhone 4S and iPad 2 to iOS 9? Of course! Although many functions are not available under the new system, iOS 9 is more stable than iOS 8. Most importantly, the system is not sluggish.

As a winner of Toutiao's Qingyun Plan and Baijiahao's Bai+ Plan, the 2019 Baidu Digital Author of the Year, the Baijiahao's Most Popular Author in the Technology Field, the 2019 Sogou Technology and Culture Author, and the 2021 Baijiahao Quarterly Influential Creator, he has won many awards, including the 2013 Sohu Best Industry Media Person, the 2015 China New Media Entrepreneurship Competition Beijing Third Place, the 2015 Guangmang Experience Award, the 2015 China New Media Entrepreneurship Competition Finals Third Place, and the 2018 Baidu Dynamic Annual Powerful Celebrity.