To make your phone or tablet faster, you can also use:
Clean RAM memory feature - you have to just click on the button, which is available in: Settings > Battery and device care > Memory
RAM Plus - you can increase the virtual memory on your device. In this case your device's storage space will be used as a virtual memory. To make the changes you have to go to Settings > Battery and device care > Memory > RAM Plus
Auto device optimisation - this feature automatically performs optimisations to keep the device running smoothly. Your phone or tablet will be automatically restarted, when not using them. This includes closing background apps and cleaning memory. To enable this feature, go to Settings > Battery and device care > Auto optimisation