To be fair it also may be the architecture that they've chosen for IE and window...

acg on Sept 24, 2009 | parent | context | favorite | on: Internet Explorer 8 runs ten times faster with Goo...

To be fair it also may be the architecture that they've chosen for IE and windows. My understanding is that bits of IE form part of the windows O/S by it's use of COM: I'm guessing that Microsoft would like to honor a lot of the interfaces for these components.