XMLSocket CLOSE and IO_ERROR event seem slow

We are using an XMLSocket and are listening for the CLOSE and IO_ERROR events. When the server closes the connection or we disconnect our internet cable it seems to take about 15 to 20 seconds for the event to be caught. In the past it seems like it used to happen instantly. Is this a known bug? or has it always been this way and I just don't remember?
I'm using Flashplayer 11.1.102.55
on Windows 7

yes, I suppose that kglad's statement is correct. I think it should be
imageLoader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandlingFunction);
(although I'm not at all certain what good it does to point out that only one of the previous replies was correct without offering any sort of further guidance or help).
As far as the thread being old, it's only about three months old by my count. And people (myself included) rely on these threads for help long after they've been closed.

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    One reason for a slowness in page loading may be the 'DNS Pre-fetching' feature of Safari 5.x as is described here:
    http://support.apple.com/kb/TS3408?viewlocale=en_US
    You can cancel DNS pre-fetching by going to Terminal and typing:
    defaults write com.apple.safari WebKitDNSPrefetchingEnabled -boolean false
    You have to restart Safari for it to take effect.
    If Safari seems to hang for ages:
    If you have a lot of tabs open and/or a lot of pages running Flash, Safari can sometimes 'hang', requiring a restart of Safari. This can often be inconvenient, and as it is rarely Safari itself that is hanging but merely one of its plug-ins, usually Flash, there is a way using Terminal to restart the plug-ins (without restarting Safari and losing your tabs) by quitting the WebPluginHost process:
    Open the Terminal from the Utilities folder in /Applications and type
    killall -9 WebKitPluginHost
    Note that this command kills all Safari plug-ins, not just Flash. All plug-ins should start back up when you reload the page.
    Then go back to Safari and refresh any pages that were using the Flash plug-in. This also fixes the Beachball of Death. Try this whenever Safari gets slow or freezes. The latest versions of Flash 10.1 onwards appear to have improved the situation somewhat, but haven't completed eliminated it.
    For this and other reasons Apple switched their websites to HTML5 in January 2011:
    http://www.appleinsider.com/articles/11/01/26/apple_revamps_its_public_website_u sing_html5.html

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