A few image optimisation techniques have been put aside, but they are worth considering:
- having the same image in multiple sizes: depending on the size of the screen, it may be useful to render a very high-quality image (e.g., on an 8K screen) or a poor-quality image (e.g., on a mobile phone). Thus, it is a good practice to have multiple images with different resolutions and to display the most accurate one.
- Better compression: some images still use JPEG, but WebP has become the norm nowadays, as its compression is much better than JPEG's. It also supports transparent backgrounds, so the PNGs should also be replaced by WebPs.
A few image optimisation techniques have been put aside, but they are worth considering: