Software Architect's Handbook

Performance affects user experience

The speed of your application plays a major role in the overall user experience (UX). A user's satisfaction with the application is influenced by the speed of the application. The performance of your application affects the organization's bottom line, whether it is because customers are being gained/lost for a customer-facing site or because productivity is being gained/lost for an enterprise application.

For web and mobile applications, the loading time for a page is a major factor in page abandonment. If a page takes too long to load, many users will simply leave. This is evident when we look at things such as a site's bounce and conversion rates.