Browser is giving you hints
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The document discusses the importance of measuring website performance to identify and optimize performance bottlenecks that negatively impact user experience. Key topics include the implications of slow loading times, user trust, and various factors contributing to performance issues, as well as available in-browser tools for performance audits. It emphasizes a user-focused approach to metrics for effective performance improvement.
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Browser is giving you hints
- 1. If you cannot measure it. You cannot optimize it.
- 2. Browser is giving you hints Are you listening? Saurabh Badhwar Software Engineer, LinkedIn
- 3. Website Performance and Why It Matters? Common Causes of Performance Bottlenecks in Website? User Implication of Performance Bottlenecks Taking Cues From The Browser Taking Measurable Actions
- 4. Web Page Size The Page Loading Time Fluidity of Interactions Prompt Feedback
- 5. Page Abandonment Rate 40% user session loss if page takes more than 3 seconds to load Returning User Sessions Drastic decrease in returning user sessions if interactions are not fluid User Trust Pages frequently throwing errors reduce user trust
- 6. Slow or High Latency Connections 2G/3G Inefficient Caching Deep Nesting in DOM Unnecessary CSS / JavaScript Unnecessary use of bells and whistles
- 7. Increased Browser Memory Use / Frequent Page Suspends (Mobile) Downgraded battery life for mobile devices Frequent Browser / Tab Crashes Jittery experience while interacting with Website
- 8. There could be multiple places requiring improvement Metrics help to narrow down and prioritize Need to be user focused and not synthetic
- 9. Time to FCP Time to FMP Time to Interactive Heap Memory Growth Style / Layout Recalculations Script Evaluations
- 10. A number of in-browser tools for developers Allows for simulation of device variants Mechanisms for doing performance audits inside Browser Lets take a look at some of the Chrome provided tools
- 11. Chrome Lighthouse Integration for running Audits
- 14. JavaScript provides PerformanceObserver API Available in all the latest browsers Can be used to monitor and report number of Performance related events
Editor's Notes
- #2: Add a takeaway Improve text to image ratio Make note about Web page sizes Give a brief about how we do the RUM monitoring related to LinkedIn
- #3: Add a takeaway Improve text to image ratio Make note about Web page sizes Give a brief about how we do the RUM monitoring related to LinkedIn
- #10: FCP First Contentful Paint FMP First Meaningful Paint
- #15: Code example taken from MDN
- #16: Code example taken from MDN