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Web Performance Load Tester is a powerful and easy to use tool that will allow you to automate load testing and generate reports to help you analyze the Performance of a web site. The 10 virtual user version, which is full featured, is free to use and is ideal for identifying pages that exceed a threshold value for further investigation.

The following message appears in the log files: Could not create an instance of the counter 'XXX' (category: 'YYY') Exception: System.UnauthorizedAccessException Message: Access to the registry key 'Global' is denied. Resolution: A Sitecore application pool user has to be a member of the system "Performance Monitor Users" group to have access to the mentioned registry key. Adding the user to this group and restarting IIS should solve the problem.

Here's a long video (probably about 2 hours) of a Sitecore performance webinar. We can probably watch this is parts.

GTmetrix uses Google Page Speed and Yahoo! YSlow to grade your site's performance and provides actionable recommendations to fix these issues.

"Performing offline defragmentation of the Active Directory database"

" Speed Tracer is a tool to help you identify and fix performance problems in your web applications. It visualizes metrics that are taken from low level instrumentation points inside of the browser and analyzes them as your application runs. Speed Tracer is available as a Chrome extension and works on all platforms where extensions are currently supported (Windows and Linux). "

Perform scheduled tasks? Like publishing?

Interesting things to speed up performance on huge sites

Page Speed is an open-source Firefox/Firebug Add-on. Webmasters and web developers can use Page Speed to evaluate the performance of their web pages and to get suggestions on how to improve them.

Performance enhancing Sitecore Modules

Performance enhancing Sitecore Modules

"Run Microsoft Exchange on VMware vSphere to not only match, but exceed the performance of physical servers by 100% or more. "

"Encrypting View State Although MAC encoding helps prevent tampering with view state data, it does not prevent users from viewing the data. You can prevent people from viewing this data in two ways: by transmitting the page over SSL, and by encrypting the view state data. Requiring the page to be sent over SSL can help prevent data-packet sniffing and unauthorized data access by people who are not the intended recipients of the page. However, the user who requested the page can still view the view state data because SSL decrypts the page to display it in the browser. This is fine if you are not concerned about authorized users having access to view state data. However, in some cases, controls might use view state to store information that no users should have access to. For example, the page might contain a data-bound control that stores item identifiers (data keys) in view state. If those identifiers contain sensitive data, such as customer IDs, you should encrypt the view state data in addition to or instead of sending the page over SSL. To encrypt the data, set the page's ViewStateEncryptionMode property to true. If you store information in view state, you can use regular read and write techniques; the page handles all encryption and decryption for you. Encrypting view state data can affect the performance of your application. Therefore, do not use encryption unless you need it. Control State Encryption Controls that use control state can require that view state be encrypted by calling the RegisterRequiresViewStateEncryption method. If any control in the page requires that view state be encrypted, all view state in the page will be encrypted. Per-user View State Encoding If a Web site authenticates users, you can set the ViewStateUserKey property in the Page_Init event handler to associate the page's view state with a specific user. This helps prevent one-click attacks, in which a malicious user creates a valid, pre-filled Web page with view state from a pre