Greg Ubben <> changed:

           What    |Removed                     |Added
           Keywords|                            |performance

--- Comment #3 from Greg Ubben <> 2010-03-02 04:09:03 UTC 
I finally tracked this down a bit. It is due to the "Vary: Cookie" header in
img_auth.php. Due to limitations in its caching engine, IE usually won't cache
pages if there is a Vary header. (See

So a work-around is to remove the "Vary: Cookie" header. Adding an ETag header
is also supposed to help.

Note that this issue also has a large impact on performance on corporate
intranets where Explorer is used a lot, since all images on the page are
reloaded every time the page is accessed.

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