14 web performance tips for 2025

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This post offers strategic advice on web performance optimization for 2025, emphasizing the importance of understanding weaknesses before attempting fixes. It warns against common pitfalls, like excessive image optimization, and stresses the significance of using real user monitoring (RUM) data to improve metrics such as Largest Contentful Paint (LCP) and Cumulative Layout Shift (CLS). The post also highlights the role of web performance in enhancing conversion rates and urges companies to cultivate a performance culture.

#webdev

#javascript

#ecommerce

#seo

May 05, 2025•7m read time•From sia.codes

Table of contents

1. Know your weaknesses #2. Understand your targets: loading speed #3. Images are usually a micro-optimization #4. Understand your targets: layout shift #5. Understand your targets: interactions #6. Prevention: Use better architecture #7. Prevention: Know the platform #8. Prevention: Analyze your options using data #9. Learn from the experts #10. Invest in a performance culture #11. Ask for help #12. Buyer beware #13. Recruit allies by explaining why performance is important #14. Make a more powerful message using your own data #Hi, I'm Sia.