To check the amount of RAM used by your Internet Explorer, open the Task Manager, switch to the Processes tab, and select the iexplore process. You can see how the memory consumption differs based on the number of tabs you open and the type of site you are browsing. Close all open windows of Internet Explorer and you see that not only the iexplore process disappears but several other processes also vanish. These are the processes that start as soon as you open any window of Internet Explorer.
If you do not know what they are, think about your download managers, Adobe IE helpers, Java, and other Internet Explorer add-ons. Other than these, people also tend to use Google toolbar with Internet Explorer. The Google toolbar has four (Google Toolbar Notifier is optional) different processes – eating up precious memory. Others have more than one toolbar installed – Yahoo, Ask, and Comodo – being the common ones.
Once you upgrade to Internet Explorer 8, you get a stable browser with several features – accessible at one point. There are plenty of add-ons, accelerators, and other features that aim to offer you single click access to your email, blog, or to discuss your papers and much more. However, in the attempt to be all-encompassing, Microsoft made Internet Explorer 8 consume most of your system resources. To check out the accelerators in Internet Explorer 8, select Manage Add-ons from Tools menu. You can understand what all comes into the picture when you open Internet Explorer.
In short, you are not running simply a browser, you are also running several other processes when you open a single instance of Internet Explorer – irrespective of its version.
Note: To check out what all Internet Explorer Add-ons and Internet Explorer Helpers are installed in your computer, I recommend you download Winpatrol. It is free and lets you monitor and disable/remove unwanted features from any version of Internet Explorer while also keeping a watch on installed programs for changes.