Go to Developer Options in the Android settings and change Window animation scale , Transition animation scale , and Animator duration scale from 1.0x to 0.5x. This speeds up UI rendering significantly on older hardware.
Instead of throwing the tablet away, custom ROMs repurpose the device into a dedicated dashboard, e-reader, or media player. Top Custom ROM Options for SM-T116 samsung galaxy tab 3 lite smt116 custom rom 2021