Speed Index (SI) in Core Web Vitals Posted on December 8, 2024December 8, 2024 By Sourabh Kumar Getting your Trinity Audio player ready... Spread the love What is Speed Index? Speed Index measures how quickly the content of a webpage is visually displayed during the page load. It’s a critical metric in the Lighthouse performance report, as it directly impacts user perception of speed and usability. Lighthouse captures a video of the page loading and computes the visual progression between frames to generate the Speed Index score using the Speedline Node.js module. Speed Index Scoring Guide Speed Index (seconds)Performance IndicatorColor Code0–3.4FastGreen3.4–5.8ModerateOrangeOver 5.8SlowRed How Lighthouse Evaluates Speed Index The Speed Index score compares your page’s performance with real-world websites using data from the HTTP Archive. A faster Speed Index score contributes positively to the overall Lighthouse Performance Score. Also Read: Total Blocking Time (TBT) in Core Web Vitals Improvement Strategies How to Improve Speed Index Here are some effective strategies: Minimize Main Thread Work:Reduce the time spent processing heavy tasks to ensure smooth rendering. Optimize JavaScript Execution:Defer or lazy-load non-critical JavaScript files to enhance loading speed. Ensure Text Visibility During Webfont Load:Use fallback fonts or preload key fonts to avoid rendering delays. Example of Speed Index Improvement Scenario: A page has a Speed Index of 6 seconds due to heavy JavaScript files and unoptimized web fonts. Steps to Optimize: Compress JavaScript files and defer non-critical ones. Use a system font as a fallback until the custom font loads. Prioritize visible content using lazy loading for images. Result: The Speed Index improved to 3.2 seconds, changing the score from Red (slow) to Green (fast). Also Read: Interaction to Next Paint (INP) in Core Web Vitals Why Speed Index Matters ? Speed Index reflects how quickly users see content during a page load, making it essential for improving: User engagement Conversion rates Search engine rankings Improving Your Overall Performance Score While optimizing Speed Index helps, focusing on your overall Lighthouse Performance score is usually more impactful. Check the Opportunities Section in the Lighthouse report to identify the changes with the most significant benefits. Example: Eliminating render-blocking resources (CSS or JavaScript) can drastically enhance performance. Speed Index Key Takeaways To improve Speed Index: Minimize JavaScript and optimize web fonts. Focus on visible content delivery. Regularly audit your page with tools like Lighthouse or WebPageTest. A better Speed Index ensures a fast, user-friendly website that keeps visitors engaged and satisfied. Download QR 🡻 Others
Best Valentine Day Wishes for Lover Posted on February 2, 2025February 2, 2025 Spread the love Spread the love Introduction Valentine’s Day is a special occasion to express your love and appreciation for your significant other. Whether through a heartfelt message, a romantic gesture, or a meaningful gift, conveying your feelings is important. Here are some thoughtful Valentine’s Day wishes to make your partner feel loved… Read More
Jobs Sealing Success: Interview Tips for Bank PO Aspirants Posted on October 29, 2023October 29, 2023 Spread the love Spread the love Introduction The Bank Probationary Officer (PO) interview is the final frontier on your journey to a successful banking career. Aspiring candidates should prepare not only for the written exams but also for the interview phase. In this blog, we will provide you with invaluable interview tips tailored… Read More
Top 100 Vaisakhi Hashtags to Celebrate the Harvest Festival on Social Media Posted on April 12, 2023January 22, 2025 Spread the love Spread the love Vaisakhi is a significant cultural and religious festival celebrated by people of Punjabi and Sikh communities around the world. This festival marks the beginning of the harvest season and commemorates the formation of the Khalsa Panth by Guru Gobind Singh in 1699. If you’re planning to share… Read More