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Don't know about the connection problems, I don't know why a company would intentionally slow down their network connection (what, you want employees to spend more time on the internet?)
Anyway, when a browser goes to display a page that's already cached, the first thing it does is ask the server "my user's trying to view this page again, got anything newer?" If the server replies "no", then you see the cached version. If the reply is delayed, then the screen stays blank.
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