In a whitepaper entitled "Enhancing the performance of Windows Internet Explorer 8," Microsoft detailed browser add-ons, toolbars, malware, restricted sites, plus more advanced topics such as User Agent String and concurrent download settings. In itself, it's a useful guide for IE8 users who’re having trouble with their browser's speed. For our purposes, though, there's some interesting information about add-ons included: “Although browser add-ons can add great new features to your browser, they can also introduce performance issues if written poorly. Add-ons cause most browser crashes, accounting for over 70% of IE8's crashes. Slowdowns in IE8’re very often caused by add-ons—especially when you open a new browser window or tab.” This document will help you learn about ways to optimize IE8 performance. Some of these tips & tricks are well known, such as Manage Add-ons dialog, but the paper addresses other irregular factors that affect performance. Familiarizing yourself with these issues that may affect IE8 performance will empower you to get the most out of your browsing experience.
Internet Explorer 8 Performance Whitepaper