using speech Started or vad events

[Ashutosh-rawat-vassarlabs]

else {
console.log(deepgram STT: [Interim Result] ${transcript});
if (speaking) {
console.log('twilio: clear audio playback', streamSid);
// Handles Barge In
const messageJSON = JSON.stringify({
"event": "clear",
"streamSid": streamSid,
});
mediaStream.connection.sendUTF(messageJSON);
mediaStream.deepgramTTSWebsocket.send(JSON.stringify({ 'type': 'Clear' }));
speaking = false;
}
}
}

rather waitinf for the interim result which comes  after every 1 second . can we use this speech started event 

or will it make some waste requests or use less requests ,
can u suggest me why have not used this vad events = true for this case . is it not a good idea to follow .