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May 22, 2012


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Lee Wharton

I can confirm this behaviour. This on top of the fact that IE9 can only run in IE8 mode with SharePoint, ruling out the use of css3 etc. Not good for a product that's been with us for this amount of time.

Marcel Meth

Finally! Microsoft has responded. They did not say why it works or what the side effects may be, but I have confirmed that the following addition to the registry does alleviate the majority of the memory leak:

Add this reg key, and restart

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_USE_LEGACY_JSCRIPT]

1) On Windows 7 start regedit (Type regedit in the start box)
2) Navigate to HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\

3) Click on Edit->New-Key Menu
5) Right Click on the "FEATURE_USE_LEGACY_JSCRIPT" item and pick the following menu New -> DWORD (32-bit) Value
6) Name it iexplore.exe
7) For a value enter 1.

Please post here to let us know whether this worked for you and whether there were any side effects.

Marcel Meth

I believe that this registry entry forces IE 9.0 to use the IE 8 scripting engine.


I contacted Microsoft as well, and it was fixed in the July 2012 CU:


Issues that this hotfix package fixes:
•When you browse SharePoint webpages multiple times in the same Windows Internet Explorer 9 session, a memory leak in Iexplore.exe occurs.

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