Artberri

WP XHProf Profiler plugin is an easy way to profile your plugins and themes when you are coding or debugging. To get it done it uses XHProf, a PHP profiler made by the Facebook Dev Team (you must install it before activating the plugin).
<h4>Usage</h4>
By default the profiling is disabled, activate <code>WP_DEBUG</code> on your <code>wp-config.php</code> to enable it. After doing it, all your wordpress pages will have a link at bottom with the profiling data.
<h4>¿What is XHProf?</h4>
From <a href="" title="From PHP documentation" rel="nofollow ugc">http://www.php.net/manual/en/intro.xhprof.php</a>
XHProf is a light-weight hierarchical and instrumentation based profiler. During the data collection phase, it keeps track of call counts and inclusive metrics for arcs in the dynamic callgraph of a program. It computes exclusive metrics in the reporting/post processing phase, such as wall (elapsed) time, CPU time and memory usage. A functions profile can be broken down by callers or callees. XHProf handles recursive functions by detecting cycles in the callgraph at data collection time itself and avoiding the cycles by giving unique depth qualified names for the recursive invocations.
XHProf includes a simple HTML based user interface (written in PHP). The browser based UI for viewing profiler results makes it easy to view results or to share results with peers. A callgraph image view is also supported.
XHProf reports can often be helpful in understanding the structure of the code being executed. The hierarchical nature of the reports can be used to determine, for example, what chain of calls led to a particular function getting called.
XHProf supports ability to compare two runs (a.k.a. “diff” reports) or aggregate data from multiple runs. Diff and aggregate reports, much like single run reports, offer “flat” as well as “hierarchical” views of the profile.
Additional documentation can be found via the xhprof website » [http://pecl.php.net/package/xhprof]
<h4>Support</h4>
Comments, questions, feature requests and bug reports are welcome: <a href="http://www.berriart.com/en/xhprof-profiler/" title="XHProf Profiler" rel="nofollow ugc">http://www.berriart.com/en/xhprof-profiler/</a>

WP XHProf Profiler

Adds PHP profiling support to your Wordpress using Facebook's XHProf Profiler.

ChrisHurst

MyWebsiteAdvisor

Simple Debug Plugin for WordPress analyzes the performance of your WordPress website and shows you the slowest performing functions. 
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MySQL Database Optimization tool is also included. 
You can also enable and view the debug.log with no editing of wp-config.php file necessary!
Developer Website: http://MyWebsiteAdvisor.com/
Plugin Page: http://MyWebsiteAdvisor.com/tools/wordpress-plugins/simple-debug/
Video Tutorial: http://mywebsiteadvisor.com/learning/video-tutorials/simple-debug-tutorial/
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Requirements:
<ul>
<li>PHP 5.3</li>
</ul>
To-do:

Simple Debug

Analyzes WordPress website performance, helps to locate slow function hooks.

WP XHProf Profiler vs Simple Debug