Google Script Running Extremely slow - google-apps-script

Question

I have written a google script attached to my google sheet. It's been working well so far apart from today when it's been extremely slow. Does anyone have any idea why?
var ssID = "1cpR6AVVpk9TF4_I38IFYPPOqk-_bSROHgVVYdaXLXOI";
var formID = "14foKaEoUA_lhDmJTJExwQ5vavsGJShWm_x1kaANLhwU";
var wsData = SpreadsheetApp.openById(ssID).getSheetByName("car_number");
var form = FormApp.openById(formID);
function main(){
var labels = wsData.getRange(1,1,1,wsData.getLastColumn()).getValues()[0];
labels.forEach(function(label,i){
var options = wsData.getRange(2,i + 1,wsData.getLastRow()-1,1).getValues().map(function(o) { return o[0]}).filter(function(o){return o !== ""});
updateDropdownUsingTitle(label,options);
});
}
function updateDropdownUsingTitle(title,values) {
var items = form.getItems();
var titles = items.map(function(item){
return item.getTitle();
});
var pos = titles.indexOf(title);
if (pos !== -1) {
var item = items[pos];
var ItemID = item.getId();
updateDropdown(ItemID,values);
}
}
function updateDropdown(id,values) {
var item = form.getItemById(id);
item.asListItem().setChoiceValues(values);
}

Answer 1

Try getting all values using batch operations, and use the minimum of API calls in the loop, like this:
function main() {
// spreadsheet
const ssID = '1cpR6AVVpk9TF4_I38IFYPPOqk-_bSROHgVVYdaXLXOI';
const sheet = SpreadsheetApp.openById(ssID).getSheetByName('car_number');
const data = sheet.getDataRange().getValues();
const labels = data.shift();
const firstColumn = data.map(row => row[0]);
// form
const formID = '14foKaEoUA_lhDmJTJExwQ5vavsGJShWm_x1kaANLhwU';
const form = FormApp.openById(formID);
const items = form.getItems();
const itemIds = items.map(item => item.getId());
const itemTitles = items.map(item => item.getTitle());
// action
labels.forEach((label, rowIndex) => {
const options = firstColumn.filter((option, optionIndex) => optionIndex >= rowIndex && option !== '');
updateDropdownUsingTitle_(items, itemTitles, label, options);
});
}
function updateDropdownUsingTitle_(items, itemTitles, title, values) {
const pos = itemTitles.indexOf(title);
if (pos !== -1) {
updateDropdown_(items[pos], values);
}
}
function updateDropdown_(item, values) {
item.asListItem().setChoiceValues(values);
}
With this pattern, the only API calls in the loop are in item.asListItem().setChoiceValues(values).