To compare results:
Go to "Test Analysis" page
Click "Search Previous Tests” button on the top to search for a previous test and view the graphs and reports.
The “Search Load Tests” form will appear.
Complete the form and click “Search” to execute your search.
Here is the result set;
Click on any one of the tests in the results window to display its test statistics, pie chart and performance graph in the “Test Analysis” window;
Next, hold down ctrl on the keyboard while clicking on multiple load test runs in the Load Test tree.
Then click the Update icon to create a graph comparing the selected tests;
The graph will show the comparison mixed graph.