Cache checking on the Node Process step (STEP 2)

Hello,

I am a newbie in the binarycloud.
Please advice, may I check (in overridden "process" method) is_Cached status
of the Node at the very begining of its processing and do nothing with
the Node and its children if cached?

E.g.

function process() {
    $result = $this->_isCached();
    if ($result == true) {
        Log::entry(BC_LOG_DEBUG,'Node is Cached. Skip processing.', __FILE__, __LINE__);
    } else {
        Log::entry(BC_LOG_DEBUG, sprintf('#Node.Process#', $this->id),
                __FILE__, __LINE__);
        $this->_modifyTree();
        $this->_processChildren();
        $this->_main();
    }
}

Where can I get performance tips and issues for the framework and my app
based on it tuning?

May I alter server response cache control options for the particular
page(Node)?

Thank you for your advice and excellent framework.

Best regards,
Igor