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The ability to measure performance is the most important part of web optimization. There is a myriad of tools to choose from that will help you determine the speed of your app. Continuing to use these tools will help you determine whether or not you are within the goals outlined in your performance budget.
New Terms:
Contend Delivery Network(CDN) -- a distributed network of proxy servers set up in multiple data centers around the world
Perceptual speed index (PSI) - a metric for measuring the above-the-fold visual performance of a view
Mobile friendliness -- a score of how well your site or app will be useable on a mobile device
Waterfall graph - a visualization of data in the Chrome Inspector that illustrates the downloading of data to the client from the server
DOMContentLoaded - an event that happens immediately after the browser fires the domInteractive event, typically is reflective of the first meaningful paint
Critical Rendering Path - to prioritize the display of content as it relates to the userβs actions
Capture Filmstrip - visual tool within the Chrome Inspector Network tab that illustrates screenshots at timestamped moments in the building of the view
Last mile -- a phrase used in internet industry that refers to the final leg of a network delivering data to a user
Web Performance Tools:
Googleβs PageSpeed Insights
Think with Google
ready.mobi
Googleβs Lighthouse
Chrome Inspector Network Tab
Further Reading:
Progressive Performance (Chrome Dev Summit 2016)
Critical Rendering Path
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