8 Optimise images
If you have large sized images this can cause the page to load slowly. Therefor it is important that you keep your images as small as possible. You can optimize the size of images to make it up to 40% less then the original size. Also there are many online tools available for optimising images. You can also use plugins or extensions for whatever large content management system you are using.
There are a few things you need to keep in mind. First of all, be careful to check your image width is not more pixels then the width of your page. On top of that you should make sure the SRC attribute of the image tag is not empty and referencing to proper image. If no source is provided then web browser makes request to your page directory and this can cause unnecessary traffic to your server.
Run the PageSpeed Insight under Google Developers to check which images needs optimization and discover to what percentage the image size can be reduced.
Finally, most websites are embedding one or more YouTube video(s). You should use optimized YouTube video embed code. This will decrease the page size by not adding the iframe on page at the page load. You can get your optimized YouTube embed code and script from this URL to get optimized YouTube code.