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First Tip | Delete Unused Apps
Second Tip | Delete Safari History and Cookies
Third Tip | Delete Certain Site Cookies
Josiah Atkinson - Fourth Tip | Clearing Your Multitasking Bar
You have just learned ways to speed up your device. Also, you can delete any excess photos to speed up your device. Doing this once a week keeps your device fast. Comment if you have more tips.
I especially recommend this for people who have really slow FaceTime, get extremely delayed texts, or feel an overall lag in their iOS.
I most definitely recommend this to people who have NEVER done any of these tips.