Having a little trouble with your site’s speed? The Site Performance plugin allows you to get a glimpse of how your WordPress site is doing and where it might be slowing down. There’s no need to insert any code – simply install the plugin and start browsing your pages.
The Site Performance plugin measures three major aspects of how your site is performing:
- Queries:

- Memory:

- Load Time:

It may be a bad plugin or a misconfiguration that’s causing your site to come to a crawl. These graphs should give you a fairly general idea about which pages are slowing you down or eating up all of your memory. Download the Site Performance plugin from the WordPress repository to start getting a peek at how your site is doing behind the scenes.
It's now incredibly easy to start your own Q&A site using nothing more than WordPress - The Q&A plugin simply and brilliantly transforms any site, or page, into a perfect support or Q&A environment.
Find out more
Would you like to add Facebook comments, registration, 'Like' buttons and autoposting to your WP site? Well, The Ultimate Facebook plugin has got that all covered!
Find out more
If you're thinking about starting a paid, or just private, membership site then this is truly the plugin you've been looking for. Easy to use, massively configurable and ready to go out of the box!
Find out more
To get a wiki up and running you used to need to install Mediawiki and toil away for days configuring it... not any more! This plugin gives you *all* the functionality you want from a wiki, in WordPress!!!
Find out more
Take, set and manage appointments and client bookings without having to leave WordPress. Appointments+ makes it easy.
Find out more
Now there's no need to pay for a third party service to sign up, manage and send beautiful email newsletters to your subscriber base - this plugin has got the lot.
Find out more
No javascript required, no third part chat engine, just fully featured chat right in your own database on your own WP sites - couldn't be easier.
Find out more
Fully integrated with the SEOMoz API, complete with automatic links, sitemaps and SEO optimization of your WordPress setup - this is the only plugin you need to help you rank your site number 1 on Google - nothing else compares.
Find out more
Out of all the WordPress ecommerce plugins available, MarketPress has got to be the winner - easy to configure, powerful functionality, multiple gateways and more. A simply brilliant plugin!
Find out more
thanks a lot sarah… just love your posts.
just fantastic.
P3 (Plugin Performance Profiler)
Much better, I think
Tested it on BlogLines.co.za and it is not working with Multi site and multi db :( but grate idea if it did work
P3 works perfectly :) http://wordpress.org/extend/plugins/p3-profiler/
This plugin (Site Performance) has a bug in its code, that generates js and outputs it on options page (where the graphs are displayed) (drawChart() function to be exact).
Not good, that not tested plugin was reviewed :(
I think the plugin was meant to just be used quickly and then deactivated after you get an idea of your performance problem.
This should come in handy when you don’t have full access to the server logs or just want to quickly identify a problem. Definitely like Sarah said, use and deactivate. Probably don’t need it on all the time.