With the Beta 4...

Please after finishing its download and installation, power off the device, then restart it going to the recovery screen and clear the cache partition.

 

Power off device, then press and hold both the volume up and sides (power) buttons at the same time until the recovery screen appears. Using a volume button to move the highlight, move it over "Wipe cache partition", press the side button. Use a volume button to highlight "Yes", press the side button. Then it will default to the top "Reboot system now" and just press the side button again to restart the device as usual.

 

If already having the Good Guardians app, and the Galaxy App Booster is installed in it, open that and begin optimizing all of the apps installed. Otherwise go to the Galaxy store, download and install Good Guardians and add at minimum that plugin (I suggest Battery and Thermal Guardians too). This will help with any issues form newer firmware being installed.