Many applications written today are web applications, so it is important to consider front-end performance issues as well as back-end performance issues. While the processing of a web page on the web server may only take a few hundred milliseconds, for example, it can take several seconds for the browser to load and render the page to the user.
Tools like Google PageSpeed Insights and Yahoo YSlow can analyze your pages for adherence to known front-end performance best practices. You not only get an overall score for your page, but a prioritized list of issues so you know exactly what items need to be addressed. Given how easy these tools are to use, every web developer should install them in their browser and analyze their pages on a regular basis.
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