IE7 Slow Performance using IE SDK (via C++) & using
Accessibility

We have developed a kind of recorder application that captures all HTML 
objects within the Internet Explorer (similiar DOM inspector but it has 
annother use case). For that we are using COM functions in C++: The 
accessibility API (f.e. IAccessible class) and the IE C++ interface (SDK, 
f.e. the IHTMLElement class, etc.).

The problem is that the same code takes for 'scanning' a normal web page 
with in IE7 about 10 seconds (P4, 3Ghz, 2 GByte) while it uses on a IE6 only 
about 0.5 seconds for the same page. Both API's (WinAcc and IE SDK) are 
slower about 20 times. It seems that there are heavy changes in the COM 
interface of IE ?!

I searched the complete MSDN and especially the IE7 pages from microsoft and 
tried a lot of settings (f.e. disabled the phishing filter, diabled all IE