Hi @Hieuy, if you are having issues with lag on your device, I suggest trying:
1. Restarting your device
Tap and hold power button > Restart
2. Ensuring your app and device software are up to date.
Settings > Software update > Download and install
If these do not resolve the issue, I suggest sending an error report within 2-3 minutes of the issue occurring for this to be investigated by our research and development team. Error reports assist with identifying any deviations in your device performance. Once analysed, our team will get back to you with a response to advise further steps. To send an error report: Samsung Members app > Get help > Error reports > select issue category > Describe issue and frequency > Tick ‘Send system log data’ > ‘Send’ in top right.
