Very slow to to do anything all of the sudden

1. One of the main reasons for iPhone running slow is the lack of updates.

2. Maybe your storage space is clogged up by some bloatware, and too many junk files.

3. If there are too many background apps, your iPhone will slow down other activities to keep the normal running of apps in the background.

4. When the network connection of your iPhone is poor, your iPhone will also get slow performance.

5. Under extreme weather conditions, iPhone running slow issue can also occur.

6. Deteriorating iPhone battery and simple aging processes can slow down your iPhone performance as well.

7. Poor and unreasonable settings of your iPhone, like motion and brightness displays, is also a common reason for slow running iPhone.

8. Malware is also likely to cause iPhone running slow issue, especially when you have a jailbreak on your iPhone.

If you want to improve the speed of your iPhone, read on this tutorial: How to Fix iPhone Running Slow?

Hey just update the iphone software frm there website. may be probably memory got fulled or the file u installed in ur phone may have virus