Over the last couple of years performance of web applications became more important to businesses as search engines (such as Google) factor in performance into their ranking. This ultimately leads to Performance == Better Visibility == More Users == More Revenue. Read more on Why Web Performance Optimization is as Important as SEO
The best way to measure the performance of your website is by looking at certain Key Performance Indicators (KPI’s) that tell you how fast or slow your web site is to the end user. Driven by efforts from web performance specialists such as Steve Souders and companies like Google and Yahoo, the industry has learned that factors such as , and are important performance indicators for a web page.