Script for upload edited image (with watermark) with gm to s3. Took the time of execution.

aws-config.js

const AWS = require('aws-sdk');

AWS.config.update({
  region: "***",
  endpoint: "***",
  accessKeyId: "***",
  secretAccessKey: "***"
});


module.exports = AWS;

watermark.js

var gm = require('gm');


var dir = __dirname + '/imgs'
var request = require('request');
const {performance} = require('perf_hooks');
var AWS = require('./aws-config');
var s3 = new AWS.S3({ region:'***', endpoint: '***'});

main();

async function main(){
    var t0, t1;
    var url = '***';
    

    t0 = performance.now();
    var height = await getHeight(request(url));
    t1 = performance.now();
    console.log("Call to getHeight took " + (t1 - t0) + " milliseconds.");
    
    t0 = performance.now();
    var buf = await createImage(request(url), height);
    t1 = performance.now();
    console.log("Call to createImage took " + (t1 - t0) + " milliseconds.");

    t0 = performance.now();
    await uploadToS3(buf, 'keylol');
    t1 = performance.now();
    console.log("Call to uploadtoS3 took " + (t1 - t0) + " milliseconds.");

}

function getHeight(image){
    return new Promise(resolve => {
        gm(image).size((err, size) => resolve(size.height));
    });
}

function createImage(image, height){
    return new Promise(resolve => {
        var fontSize = height/20;
        gm(image)
        .fontSize(fontSize)
        .stroke("#000", fontSize/23)
        .fill("#fff")
        .drawText(20, height-fontSize/3, "La mejor inmobiliaria del mundo mundial")
        .toBuffer((err, buffer) => resolve(buffer));            
    }); 
}

function uploadToS3(data, key){
    var data = {
        Bucket: "***",
        Key: "my-image.jpg",
        Body: data,
        ContentType: 'image/jpeg',
    }
    s3.putObject(data, function(err, res) {
        if (err) {
            // Failed saving to S3
            console.log('Failed saving to S3', err);
        }else{
            console.log("done");
        }
    });
}