The Developer Dashboard has undergone some significant changes in 2013. E.g. it is now running in a separate browser window and also allows to show ULS log entries related to the current request.
The following article gives a brief overview of the new functionality:
http://blah.winsmarts.com/2012-7-SharePoint_2013_Developer_dashboard.aspx
Beside these changes, the Developer Dashboard can now be extended by injecting custom JavaScript code into the developer dashboard window.
Two steps...(read more)
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