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A program I use creates ActiveX browsers to render webpages and I understand this uses the installed Internet Explorer browser instead of a copy of it's core. So the program must be forcing IE7 compatibility mode because the useragent returns MSIE7 when IE8 or IE9 are installed.

So would it still be as fast for JavaScript, using the GPU, rendering big tables and overall speed?

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not having used IE9 yet.. I am surprised they still have IE7 mode built into it.. geez.. let IE6/7 die already. – Jakub Feb 15 '11 at 13:55

While this is not a true test, I ran IE9's Psychedelic Browser test and V8 Benchmark suite in both normal and compatibility view.

Normal view

Psychedelic normal

V8 Normal

Compatibility view

Psychedelic compatibility

V8 benchmarks:

V8 compatibility

There isn't much of a difference between both, so I guess it's fair to say that it should be as fast & will definitely use the GPU under IE7 mode

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