Gulp image compression for Page Speed of Google, 37% of compression aprox.

gulp-image-compressor-page-peed-google.txt

install node
install npm
put package.json
npm i
create _src/ and dest/ folders
put image files to _src/ folder
then "npx gulp" to run

gulpfile.js

var gulp                   = require('gulp'),
		imagemin               = require('gulp-imagemin'),
		imageminJpegRecompress = require('imagemin-jpeg-recompress'),
		imageminPngquant       = require('imagemin-pngquant'),
		newer                  = require('gulp-newer'),
		debug                  = require('gulp-debug');
 
exports.default = () => (
	gulp.src('_src/**/*')
	.pipe(newer('dest'))
	.pipe(imagemin([
		imageminJpegRecompress({
			progressive: true,
			min: 70, max: 75
		}),
		imageminPngquant({quality: [0.7, 0.75]})
	]))
	.pipe(debug({
		title: 'Processing:',
		showCount: false
	}))
	.pipe(gulp.dest('dest'))
);

package.json

{
  "name": "desktop",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "gulp": "^4.0.2",
    "gulp-debug": "^4.0.0",
    "gulp-imagemin": "^7.1.0",
    "gulp-newer": "^1.4.0",
    "imagemin-jpeg-recompress": "^7.0.0",
    "imagemin-pngquant": "^9.0.1"
  },
  "dependencies": {
    "gulp-cli": "^2.3.0"
  }
}