It's very important to maintain a distinction between functional tests of your web applications, front-end web performance, and tests of your network and servers under load.
- Load tests, in contrast, should gauge and output network and server performance metrics. For example, can your application server handle a particular load, and does it behave as expected when you push it to its limit? These types of tests are better undertaken with a testing infrastructure that has been specifically developed for load testing, so all baseline performance metrics are well established and understood before you start the test.
By maintaining the distinction between functional, front end performance tests, and load tests, and the different outputs that you expect from them, you should be able to more precisely design your tests to uncover the specific kinds of issues that you need to address to make your application more robust under any conditions.