https://bugzilla.wikimedia.org/show_bug.cgi?id=18858
Greg Ubben <gregub...@comcast.net> changed:
What |Removed |Added
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Keywords| |performance
--- Comment #3 from Greg Ubben <gregub...@comcast.net> 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
http://blogs.msdn.com/ieinternals/archive/2009/06/17/Vary-Header-Prevents-Caching-in-IE.aspx)
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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