Tweak List that helps speed up an old iPhone 4 : jailbreak
Fast charge your iPhone and iPad - Apple Support
Jan 14, 2014
It's easy to speed up a video on your iPhone – or return a Slo-Mo video to normal speed – using the iMovie or Photos apps, respectively. Here's how.
How to speed up a video on an iPhone in 2 different ways It's easy to speed up a video on your iPhone – or return a Slo-Mo video to normal speed – using the iMovie or Photos apps, respectively. Here's how.