http://blog.solidsoft.com/blogs/andrew_james_1957/archive/2008/06/25/480.aspxHave a look at the following investigation by Sam Allen..... "The author developed a program to snapshot memory usage per process every 3 seconds on Windows. Using this he recorded 3 hours of memory usage for five different browsers under real-world usageen-USCommunityServer 2.0 (Build: 60217.2664)