Monitoring Application Performance on the Frontend in the Age of Impatience` In today's fast-paced digital age, internet users expect seamless and interactive experiences with quick load times, making it essential to monitor application performance on the frontend. As developers, we should prioritize tracking specific performance metrics to diagnose and solve problems as they arise, rather than just focusing on server-side monitoring. To achieve this, we can use various tools and techniques, such as reducing render-blocking assets, image optimization, lazy-loading, caching, and content-delivery networks, from the outset of application development. Tools like Google's Page Speed and Analytics, Yahoo's YSlow, WebPagesTest, Chrome DevTools, Firefox's Performance by Firefox, and Safari's Timeline can help us monitor browser performance, but it's also beneficial to use a Time Series Database to collect and store performance metrics over time for long-term analysis and troubleshooting. By tracking performance regularly, we can identify dips and spikes in errors, performance ratings across different browsers, and specific error patterns, ultimately improving the user experience and positively impacting the frontend performance of our web applications.