To make it feel like an app, tap the Share button (the square with an up arrow) and select "Add to Home Screen." This places a Facebook icon on your home screen for one-tap access. Performance Tips for iPhone 6
Running a resource-heavy social network on 1GB of RAM can be taxing. To improve performance:
When the iPhone 6 launched, the Facebook app was already notorious for two things: and running hot . The iPhone 6’s A8 chip and 1GB of RAM were powerful for 2014, but Facebook’s background app refresh and auto-playing videos turned the aluminum chassis into a hand warmer.