Your iPhone may be running out of storage space.

Slow performance might indicate a memory issue, such as inadequate memory. Your iPhone, for example, may have reached its storage limit and is no longer able to handle additional content or processes. This is most likely the case if you have a habit of installing complicated programs and contents to your smartphones, such as gaming apps, as well as certain films and music files, and then storing them on your device even when they are no longer needed.

Memory problems might also occur if you often multitask on your smartphone or use many apps at the same time. As a result, the iPhone's memory will most certainly overflow, and it will no longer be able to perform additional jobs or user requests in the queue. As a consequence, your device will become sluggish, lag, become unresponsive, and even crash.

Multimedia communications and other sophisticated content, including images, movies, and gaming programs, that have accumulated in your iPhone's file directory and sub-folders must be removed or migrated to other storage media in order to free up storage space. These sorts of files may take up a lot of space on your iPhone's internal storage, causing your device to slow down over time.

 Reset All Settings.

You can try resetting all of your iPhone's settings. This can aid in the removal of faulty settings files and incorrect app settings, both of which can create performance difficulties on your device.

After the procedure, all of your applications will revert to their normal settings, without deleting any apps or data from your smartphone. This means that following the reset, you'll have to sign in to your applications again. As a result, this should only be attempted after you have exhausted all other options.

Go to Settings-> General->Reset->Reset All Settings to give it a go. Wait for your iPhone's factory default settings to be restored. After the procedure, you should notice a substantial boost in the processing performance of your iPhone.