1. Boost memory
The simplest way to a faster Mac is by installing extra RAM. Before you buy, check the maximum RAM capacity of your Mac. You can download a free program called MacTracker that will tell you the precise technical specifications of every Mac ever produced.

2. Install RAM in pairs
Many Macs will give you a speed boost if you install matching RAM modules in pairs. G5 and Mac Pro towers actually require the installation of pairs of modules, though most other Macs will allow the use of an odd number, with the proviso that you won’t get the fastest possible performance from them. Crucial’s website will tell you the specifics for your model.

3. Faster drive
Installing a faster hard drive as the boot drive on a tower Mac will yield performance gains, especially if you go up to a 10,000-speed drive. On a laptop, installing a 7,200rpm drive (to replace a 5,400 rpm model) will also make things faster, though older Mac portables don’t have user replaceable hard drives More »

This tweak is for broad band cable connections on stand alone machines with WinXP professional version – might work on Home version also. It will probably work with networked machines as well but I haven’t tried it in that configuration. This is for windows XP only, it does not work on win2000. I use 3 Com cards so I don’t know how it works on others at this point. It does not involve editing the registry. This tweak assumes that you have let WinXP create a connection on install for your cable modem/NIC combination and that your connection has tcp/ip – QoS – file and print sharing – and client for Microsoft networks , only, installed. It also assumes that WinXP will detect your NIC and has in-box drivers for it. If it doesn’t do not try this.
In the “My Network Places” properties (right click on the desktop icon and choose properties), highlight the connection then at the menu bar choose “Advanced” then “Advanced Settings”. Uncheck the two boxes in the lower half for the bindings for File and Printer sharing and Client for MS networks. Click OK More »