Images should be optimized to load quickly. This means choosing the most appropriate file format and settings to compress the file.

Images often account for most of the size of a web page. As a result optimizing images can often yield some of the largest performance improvements.

As a general rule, images comprised of flat colour (e.g. logos) should be saved as PNG or SVG files. Photographs should be JPEG images set to around 85% compression, which offers substantial size savings at a minimal loss of detail.

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