Not sure what you mean by "buttons". IF you are trying to change voices, a lag between sounding of the old and new voice can be expected as the generators within the synth are reconfigured for the new voice. This is a lower-end synth and as a result doesn't haved the performance of some of the newer ones.
If the lag is just between notes that are being keyed using the same voice, that is too much delay and something is probably set wrong.
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