Speed up a sluggish iPhone while you slowdown. Computing devices tend to slow down over time, as components wear out, storage and memory fill up with old files and forgotten apps, and new software is increasingly designed for newer and faster processors. You can put off the inevitable by following some simple best practices, including: From time to time you should power off your device completely. This clears out the memory. You should also get into the habit of deleting apps and files you don’t use (photos are a common issue for storage) and archive the latter in cloud and/or local backup. It’s also worth going through the settings and checking which apps refresh in the background, thereby using up precious processing power.