Oops my ignorance is showing! general iweb question

Hello everyone,
I have seen some posts with file size questions and download time, but I do not understand something and perhaps someone can tell me. If I post a one page with a 20 meg movie and very little else on this page does it affect the download time of my entire site or is it pretty much one page at a time independently of the other. so that if we have a huge site with a lot of pages it does not matter.
I hope I was clear enough in my question. English is not my primary language and sometimes I am not as clear as I should.
Thank you all in advance
Mireille

You might have noticed that some sites (and the pages of the site) on some servers at some time load slow... This is because servers are getting too many requests and can't elaborate all of them quickly enough...
It's like you're a real Londoner and you have 20 tourists around you and each of them is asking you how to get to a place (every single tourist wants to get to another destination so you will not find two tourists who want to get to the same place) and this at the same time...
It's obvious that you can't listen and give indications to 20 people and about 20 different destinations at the same time. You then would be a slow server elaborating one request after the other
The .Mac server seems to be a real Londoner... (please Londoners out there don't take that personally, I love London and I love Londoners! It's just an example)
PS: obviously servers can elaborate more requests at the same time than a human does...
I just wanted to write that to complete the answer...
(Same is happening to computers if working on many applications at the same time and so on...)

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