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Development Tools Front End Web Optimization Workflow Why Performance Matters Building Mobile First

Regarding mobile-first development: Questions about mobile-first mindset and images.

If i'm building for phones, my images don't need to be wider than 480px. This saves space and makes it easy to optimize images.

However, few apps or websites are SOLELY intended for mobile.

I'm going need an image that looks good on a 2000-px desktop. Are you saying that I should start using media queries to specify sizes of images based on the viewport width? Doesn't that extra code bog down performance as well?