Manual deals with more of test cases,
Executing them on the application, reporting bugs...
Automation deals with more of scripting,
Changing the test case to a test script, test suite execution on the application - again final aim is to find bugs…
Performance deals with more of Server Response Times,
Load testing, Stress testing, Monitoring - again to find out performance violations...
There cannot be Automation without Manual Testing (Test Cases),
There cannot be Manual Testing without Performance (availability of the application for testing)
