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Dear Samsung Member,
Greetings from Samsung Customer Support!
Please be assured and to resolve "device lagging" issue kindly follow the given below step:
>> Check device in Safe Mode:-Press and hold the Power key, when Power off icon appears > Press and hold the power off icon.
To exit safe mode:-Restart your device.
Please visit this mentioned link for more information: https://www.samsung.com/in/support/mobile-devices/how-to-restart-the-device-when-freezed-or-hanged/
If the issue still persist, kindly register your concern in Samsung Members app (Samsung Members app > Get help > Feedback > Error report).
Note: Please send device log files within 15 minutes of issue occurrence along with the exact issue details.
Thank you for writing to Samsung.
Samsung Customer Support