Windows Media Player "media changing...." message

Why do some videos play immediately, and some take up to 30 seconds with a
"Media changing..." message in the lower left corner? With my old system
(XP), all video playback was essentially instantaneous. Any way to remedy
this?

What file types hang for 30 seconds? Is it common to file types, or - what
are the common elements of the hangs?

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Speaking for myself only.
See http://zachd.com/pss/pss.html for some helpful WMP info.
This posting is provided "AS IS" with no warranties, and confers no rights.
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"Dan" <Dan@discussions.microsoft.com> wrote in message
news:C412F95C-567F-40D6-9910-65C24DB75DB3@microsoft.com...
> Why do some videos play immediately, and some take up to 30 seconds with a
> "Media changing..." message in the lower left corner? With my old system
> (XP), all video playback was essentially instantaneous. Any way to remedy
> this?