Page Loading Speed.
Ranking higher in a search query you will have to have good loading speeds on your website. You want to keep your loading speed below 2 seconds or a user might leave your site before even seeing your content. This will mostly affect mobile users who tend to be on lower connection speeds even more so in developing countries. Loading speed is also affected by your hosting provider and how much resources your hosting account comes with as well as the above mentioned CDN. Many steps in this Joomla SEO guide are there to increase your loading speed and why the GTMetrix score is so important for attracting more viewers.
The biggest factor on your site in terms of page size is the use of images you want to use as many images as possible to illustrate your content without slowing down the loading speed. Images like high resolution or even infographics will use more Kb's then really needed. Also to consider here is the width and height size of a 4K picture that will only be displayed in 400px will impact your website performance.
- Ensure you use the right physical sized image in pixels.
- Decrease the image size by compressing it using TinyPNG.
- Add Title tags, Alt tags and descriptions to your images.
- JPG is preferred unless you need a transparent background.