Why System Performance Test?
1.Application response time
– How long does it take to complete a task?
2.Configuration sizing
- Which configuration provides the best performance level?
3.Acceptance
- Is the system stable enough to go into production?
4.Regression
- Does the new version of the software adversely affect response time? 

Why Load Test?

Load Test is designed to answer vital questions such as:

• Do you know the number of concurrent users/requests your application can support ?
• Is your current infrastructure sufficient to meet your user demand ?
• Will your application scale as more users access it ?
• How does your application's response time change as number of users increase ?
• Does your Web application perform the same after 96 hours of deployment as it did after 4 hours ?

Load Test can help you identify a variety of problems before you go into production:

• Software design issues (incorrect concurrency/pooling mechanism, poor optimization, memory build-up, etc.)
• Server configuration issues (Web server, application server, database server, load balancer, etc.)
• Hardware limitation issues (Excessive disk I/O, CPU maximization, memory limitations, network bottleneck, etc.)