A notable number of users who have installed i OS 9 on their i Phones, i Pad, and i Pod touch have discovered that i OS 9 has caused performance to suffer, with annoying lag, choppiness in interactions, delayed response from the user interface, and just general performance degradation.
That lag can be notable enough to make the device feel considerably slower on i OS 9 than when compared to the same hardware running a prior version of i OS.
Though people seemed to have mixed results with this, force rebooting is easy to do: Now then let it boot up as usual, does it run any faster? If you feel like i OS 9 is just unbearably slow and you can’t stand it, you can downgrade back to i OS 8.4.1 pretty easily, but you will likely have to setup the device as new, or restore from an older backup.
Another option is to wait for i OS 9.1 to be released, which is likely arriving next month with the i Pad Pro, as i OS 9.1 should almost certainly include performance improvements and bug fixes which may be causing the performance issues with i OS 9.
Readers may recall we warned of this exact issue in our guide to prepare for i OS 9 (see #2), and now that i OS 9 is in the wild, it’s not just old hardware that has seen negatively impacted performance.For what it’s worth, the performance of keeping those visual effects enabled in OS X did improve with El Capitan, and given that i OS 8.4.1 ran fine with eye candy enabled on most i OS devices, it’s quite likely that performance for visual effects will improve in i OS 9.1 too.Background App Refresh is an interesting feature that allows background app activity in i OS, but while it’s well intentioned it can lead to a decrease in device performance.Also, by enabling Reduce Motion, you end up with a nice transition effect, which some users prefer anyway.If you’re a Mac user and this sounds familiar, it’s because you can increase the speed of OS X and general performance by also disabling transparency and visual effects, so perhaps i OS and OS X both could use some optimization in the visual department, but in the meantime if you experience sluggishness, learn to be satisfied without having fancier looking translucent windows.