Right: Picking a previous route in Maps on an i Phone 4s is now almost impossible.
More significantly for old hardware users is Apple's claims that "the apps in i OS 9 now take advantage of Metal, making more efficient use of the CPU and GPU to deliver…
At least flicking through home screens is reasonably smooth, even if using complicated apps isn't - scrolling through the Guardian app on the i Phone 4s or i Pad mini is surprisingly juddery.
The i Phone 4s was launched in October 2011, with its 3.5in, 640 x 960 screen and Apple A5 chip running i OS 5 (the first version to include Siri).
For a four-year old smartphone to receive a significant update in 2015 is remarkable.
Instead it merely shuts down background app updating, push email, the fancy interface graphics, dims the screen and enforces options such as Auto-Lock.
It's handy enough, with i OS offering the option once you're down to 20% battery and automatically turning off Power Saving Mode once you're charged back to 80%.
better overall performance", while "apps and key technologies have been made more efficient to trim battery usage".