Well, there are "ways" of making things faster. Typically, the benefit-to-annoyance ratio is fairly high. That is to say, you tweak a lot of junk for little gain.
The section you'd mostly be interested in is:
Tweaking /proc/sys/net: Networking
Keep in mind, if you are using a cable modem, you are already in trouble. Cable modems are typically high on the download rate and low on the upload rate (from the perspective of the cable modem). Switch to DSL if this is a serious adventure.