I created a music player UI but when I click preview or present it doesn't come properly it lags , disturbs , some part comes while some part don't come I can't fix it if there is any solution please write me . Thank You

I created a music player UI but when I click preview or present it doesn’t come properly it lags , disturbs , some part comes while some part don’t come I can’t fix it if there is any solution please write me . Thank You .