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If you have a large class that executes after output(headers/text) is already sent, will that have any affect on your applications performance?
Edit: To clear things up, when output is sent, default headers are sent with it.
The execution speed of the PHP will be the same regardless of whether the headers have been sent.
If you can send some HTML (for example the
<head>section) then it can actually make your page load faster, as the client can begin to download CSS and javascript files, and start to render the page if you send enough HTML.