The server healthcheck screen runs diagnostic tests against the SQL Server and gives warnings & recommendations based on what it finds.
Results are either "Warning" - action should be taken to remedy the problem; "Info Only" - a definite course of action cannot be given but user experimentation should be performed or "Ok" - the test passed.
Clicking on a warning in the grid will display and related details in the textbox at the bottom of the screen.
The diagnostics include checks of disk, memory, security, agent jobs, query optimisations and other common performance pitfalls.