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frontend performance monitoring 101

frontend performance monitoring is essential to ensure a smooth user experience. poor performance can lead to increased bounce rates, lower conversion rates, and overall user dissatisfaction. this tutorial will cover the basics of frontend performance monitoring, including key metrics to track, tools to use, and a simple code example for implementing performance monitoring in your web applications.

key metrics to monitor

1. **page load time**: the time it takes for a page to fully load. this includes all resources (html, css, javascript, images, etc.).
2. **time to first byte (ttfb)**: the time from when a request is made until the first byte of the response is received.
3. **first contentful paint (fcp)**: the time it takes for the first piece of content to be rendered on the screen.
4. **largest contentful paint (lcp)**: the time it takes for the largest piece of content (usually an image or large block of text) to be rendered.
5. **time to interactive (tti)**: the time it takes for the page to become fully interactive.
6. **cumulative layout shift (cls)**: a measure of unexpected layout shifts during the loading phase.

tools for performance monitoring

1. **google lighthouse**: an open-source tool that audits performance, accessibility, best practices, and seo.
2. **web vitals**: a set of metrics that focus on user experience, easily integrated into your application.
3. **new relic**: a commercial monitoring solution that provides detailed insights into application performance.
4. **sentry**: primarily an error tracking tool, but also provides performance monitoring features.
5. **browser developer tools**: built-in tools in browsers like chrome and firefox to measure performance metrics.

implementing performance monitoring

using the web vitals library

the web vitals library by google provides a simple way to monitor key performance metrics. here’s how to set it up:

1. **install the web vitals library**

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