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Then I think you need to download more of the Internet to your PC :-)
If I use Google, as http://www.lmgtfy.com/?q=oracle+database+control+performance+tab then under the Google "Images" Tab there are lots of screenshots with the performance tab, along with the websites where they can be found like here: http://docs.oracle.com/html/B14338_02/admin.htm
If you use Database Control on a Standard Edition database I'm wondering if the Performance Tab is actually shown.
In 11G Grid Control it is only available for Enterprise database WITH the Diagnostic Pack installed. For all other databases it is turned off.
And yes, I know you can turn it on, but then you're violating your license. Be aware of that !!!
Anyway, I doubt if you really, really searched online