What App do you use the most?
Make sure you have enabled iCloud to auto-backup/sync your iPhone/iPad. So you don't lose your pictures, Apps data, etc...
For your mobile phone to quickly charge, place phone into Airplane Mode, turn off the display/set phone in standby, let it charge.
Great personal finance management App for personal/business use, a bit more stable than Mint; https://appsto.re/us/O-kfE.i
If using a Windows computer, look into enabling Tracking settings to help speed up your browsing. Sites like cnn.com, msn.com, cnet.com and others use a ton of 3rd party Ad sites that can steal CPU and memory from your computer. See instructions/details here; https://www.julianevansblog.com/2014/09/how-to-setup-windows-7-internet-explorer-11-ad-blocking.html