Supply some more power to your iPhone by doing some minor modifications to certain vital settings. Alternatively, there was a priority established to Background App Refresh to allow apps to refresh the content even after closing them. You can selectively enable or disable this to specific apps or you can turn it down completely. Switching off the automatic update of applications is recommended and so is limiting the visual effects that could be displayed through the option of Reduce Motion. Such small changes free the memory and computer capacities, which causes the iPhone experience quicker and more fluent.
When I need my iPhone to run smoother, I change three settings right away. First, I turn off Background App Refresh because too many apps running silently can slow things down. Second, I reduce Motion and transparency under Accessibility, since those effects look nice but eat up processing power. Third, I clear out old widgets I don't actually use — they refresh constantly and drag speed down. I started doing this before long sourcing trips from Shenzhen, where I rely on my phone to manage orders and supplier calls. It makes a clear difference, and the battery lasts longer too.