We'll create fresh WordPress site with info installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Plugin shows in the admin bar:
* the number of SQL queries during the WordPress execution
* the amount of time in seconds to generate the page
* memory load
Admin bar can be enabled in your profile: "Users => Your Profile => Show Admin Bar"
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This information also added to the bottom of the source code as HTML comment.