IE10 compatibility mode javascript speed

Hello experts,

I know that IE10 is much faster in processing javascript than IE8. But what happens if I have a site that has to run in IE10 compatibility mode?
Is just the site rendered in an older IE version and I still get the improved javascript speed from IE10? Or is the whole site processed in an older IE version and I actually don't have any benefits from IE10 for that specific site?

Thanks for your help,
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David Johnson, CD, MVPOwnerCommented:
It uses the older rendering engine, why don't you recode your website to follow W3C standards?
arthrexAuthor Commented:
Because I'm talking about Microsoft Dynamics CRM 4.0 and it will take some time to update it to Version 2011
The browser has to build the document object for compatibility mode in a less efficient way.  scripting primarily on the Document Object, so the less efficient object will result in slower scripted responses.  Depending on what the scripting is doing it might even be marginally slower than real IE7, because the browser has to put in hooks and an interface layer so it does not forget that it is really IE10.


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