Ur device is on biannual and u will get 2 times a yr update with security patch and big fixes.
U can use 3rd party app
For virtual ram
Dear Samsung Member,
Greetings from Samsung Customer Support!
We acknowledge your query and apologize for the same. To resolve your device hanging issue please visit this link: https://www.samsung.com/in/support/mobile-devices/how-to-restart-the-device-when-freezed-or-hanged/
In case the issue still occurs. Please register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Thank you for writing to Samsung.
Samsung Customer Support