How much faster could I make this script? - google-apps-script

Question

I have noticed that the script is significantly faster when I comment out the line that calls setValues(). Not that it's a super big issue, but I am interested in the different ways (if any) that I could speed the process up. If anyone has some insight, I would greatly appreciate it! It would also help me see where I could make similar optimizations in other parts of my script.
Here is the code in question:
// import new value(s)
if ((numRaw - numDk) > 0) {
var iDate;
var lastRow = getLastDataRow(earSheet, columnToLetter(earSheet.getRange("EAR_DATES_RNG").getColumn()));
var distName = impSheet.getRange("A1").getValue().toString();
var defaultDept = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("All Lists").getRange("A2").getValue().toString();
impData.forEach(function (entry) {
iDate = new Date(entry[0]);
var newEar = earSheet.getRange("A" + lastRow + ":G" + lastRow).getValues(); // init copy
if (currData.get(iDate.getTime()) == null) {
newEar[0][0] = entry[0];
newEar[0][1] = distName;
newEar[0][6] = entry[1];
newEar[0][3] = "Royalties";
newEar[0][4] = defaultDept;
newEar[0][5] = "NOT SPECIFIED";
earSheet.getRange("A" + lastRow + ":G" + lastRow).setValues(newEar);
Logger.log("ADDED: " + entry[1] + " to row: " + lastRow);
addedNewData++;
lastRow++;
}
else {
Logger.log("EXISTING DATA FOUND: " + currData.get(iDate.getTime()));
}
});
}

Answer 1

Using Matt and Cooper's suggestions, I came up with this revised code which is significantly faster:
if ((numRaw - numDk) > 0) {
var iDate;
var prevLastRow = getLastDataRow(earSheet, columnToLetter(earSheet.getRange("EAR_DATES_RNG").getColumn()));
var currLastRow = getLastDataRow(earSheet, columnToLetter(earSheet.getRange("EAR_DATES_RNG").getColumn()));
var rangeSize = numRaw;
var distName = impSheet.getRange("A1").getValue().toString();
var defaultDept = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("All Lists").getRange("A2").getValue().toString();
var newEar = earSheet.getRange("A" + prevLastRow + ":G" + (prevLastRow + rangeSize - 1)).getValues(); // init copy
impData.forEach(function (entry) {
iDate = new Date(entry[0]);
if (currData.get(iDate.getTime()) == null) {
newEar[currLastRow-2][0] = entry[0];
newEar[currLastRow-2][1] = distName;
newEar[currLastRow-2][6] = entry[1];
newEar[currLastRow-2][3] = "Royalties";
newEar[currLastRow-2][4] = defaultDept;
newEar[currLastRow-2][5] = "NOT SPECIFIED";
Logger.log("ADDED: " + entry[1] + " to row: " + currLastRow);
addedNewData++;
currLastRow++;
}
else {
Logger.log("EXISTING DATA FOUND: " + currData.get(iDate.getTime()));
}
});
earSheet.getRange("A" + prevLastRow + ":G" + (prevLastRow + rangeSize - 1)).setValues(newEar);
}```