Embedded video causes slow page load

Hi,
I recently noticed that any flash content webpage loads real slow in Firefox or Safari. It takes about 6 seconds for a webpage to load if there is a little YouTube window on it. In those 6 seconds the browser is unresponsive.
Is there anything I can do to speed this up?
Thanks

I have cleared my cache in Safari and Firefox - nothing changed.
I installed Flash 10.1 RC - no difference
I installed the Flash blocking addons - when I then click on the video window it takes the same amount as before to load (not surprising). But why is so slow to begin with when it comes to YouTube embedded content?
here is the website of our kids soccer club - it takes 8 seconds for the World Cup YouTube content to be available - playback is fine, but until it loads it takes 8 seconds - and for that time the browser is unresponsive (spinning wheel)
I have 256MB VRAM on the card (Radeon 9800 Pro) and otherwise 4GB RAM!
Thanks

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