Speed up a website twice

In this video I ll show how to apply Google PageSpeed Insights s recommendations and accelerate a website significantly. The main points are: 1. Prepare optimised CSS and JavaScript files for each template via gulp. 2. Divide CSS into critical and noncritical parts. Insert the critical part right into a HTMLdocument s body. 3. Set generation of images for different browsers and devices. Use HTML tags picture and source. 4. Introduce images lazy loading. There are links form the video there: There