Scalability is a measure of how an application would react when the resources at its disposal are scaled up. If an application supports 10,000 users with a given infrastructure, can it support at least 20,000 users with double the infrastructure?
If a web application does not respond within a couple of seconds, there is a very high chance that the user of your application will be disappointed. Performance usually refers to the ability of a system to provide an agreed-upon response time for a defined number of users.
In the world of Cloud, the scalability of applications becomes even more important. It's difficult to guess how successful a startup might be. Twitter or Facebook might not have expected such success when they were ...
