Best iOS 9 Cydia Tweaks for Better Performance

Activator

While Activator itself isn't a jailbreak app made to improve iOS performance, you can use it to your advantage in such a way.

Activator is jailbreak app that allows you to automate certain tasks and set up shortcuts for various actions. One great way to use Activator to improve performance is to schedule a reboot every night while you're sleeping.

This can be great because a simple reboot can fix most iOS problems, so if your iPhone is feeling a bit sluggish lately, it may just need rebooted in order to give it a fresh start.