Hi @AlanB2506 have you tried running in Safe Mode to determine if any Apps are causing the issue .
Another idea is to wipe the cache partition:
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My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .
@AlanB2506: If the tablet performed better while in Safe Mode, then the issue may be stemming from third party app background activity. To keep your tablet running smoothly, I recommend regularly tapping the Recents button in your Navigation Bar (3 vertical lines) and closing any apps you're not using by swiping upwards on the preview window, or hitting 'Close all'. Also, head to Settings > Battery and device care > Optimise now, followed by Memory > Clean now. You should also restart the tablet every 24-48 hours to address any temporary software issues that might be affecting the performance.