Slow, But At The Other End

Last evening, when traveling home by train, I downloaded a 6 MB PDF specification document over HSPA and was actually surprised it took longer than just a couple of seconds. The download speed was roughly about 2 MBit/s. Strange I wondered, why is the network so "slow" tonight? Turns out it wasn't the HSPA network that was "slow", it was the server on the other end that couldn't deliver the document faster. Even over my 25 MBit/s VDSL line at home, the document wouldn't load faster. So I wondered, since when do I percieve a download rate of 2 MBit/s as slow? And secondly, it seems this was the first time I consciously realized that a server on the network could not fill up the bandwidth available I had on the wireless network.