If you are at home on your dial-up connection, you can directly blame
your Internet provider for being the worst in the country.
If you are at the coffee shop, you're on a public WiFi connection with
who knows what sniffers, flow control and what-knot going on.
If you are at the coffee shop, there is also a chance that you are
subject to a MITM attack and all bets are off.
Themed Olympus Photo Exhibition: http://www.tope.nl/