9 First Check on Your Performance
First things first: you’ll probably want to see how fast your iPhone is before you actually take any steps to speed it up. Luckily, there are a variety of speed testing apps that you can use to check the performance of your own device.
Geekbench 4 and AnTuTu are both good options for testing your CPU performance.
Those apps may be able to spot any performance abnormalities with your iPhone. On the other hand, speed tests like Ookla won’t give you any details on your iPhone’s performance. Instead, they test LTE or Wi-Fi speeds. So make sure the app you’re using actually tests CPU or iOS speed.
If you do notice sluggish behavior or generally slow performance on your iPhone, read through the rest of this gallery to find out speed-enhancing tips.