What Limits Download and Upload Speed of a web site?

Question:
What Limits Download and Upload Speed of a web site?
I am uploading the file to my web site. You can download it from there.
If you do (currently FTP Pro is telling me that the upload will take 45 minutes) could you tell me why is the file so big?

Answer:
Many Factors limit speed.
First thing to limit your speed is

1. The speed of your internet connection from your internet provider. (Dialup, DSL or Cable modems.) Local wire and network conditions also affect speed.
2. Internet provider may have modem set at the wrong speed.
3. Cables in neighborhood may have trees hitting cables, water shorting out cable connectors or damaged cables causing intermittent loss of connection or reduced connection speed.
4. Modem or your in house cables may be bad.
5. Use of Wireless networks cause massive reduction is speed the farther away from the antenna you move until you have not speed at all.
6. Power Outages, Hurricanes, Thunderstorms Earthquakes, Tornadoes can your ability to connect.
7. The speed of the server and connection from internet provider to the internet. (Evenings after work may slow down connections, which may speed up after midnight. Or internet may be completely “not available” when these servers are down for maintenance or power failure.
8. The speed of the server and bandwidth of the web site you are viewing. (many websites are severed from one shared computer)

Upload speeds are often a fraction of the download speed of a connection.
DSL and Cable modems upload at max of about 25k / sec,
while download speeds can go to 500k (with a 5 megabit connection)