I do internet tech support. When it comes to speed issues, it could be any one of a number of things, ranging from the signal outside the house to the modem and sometimes something on the user's end. Here's a few things to look into:
- Bad Splitter -
Plug modem directly into outlet to ensure that isn't an issue
- Firewall -
Disable them to make sure no ports are being blocked that shouldn't be
- Other applications (i.e. P2P, torrents) -
Shut down any application (excluding the browser, of course) that likes to hog bandwidth
- Virus/Spyware -
Hopefully this isn't an issue, but you can't afford to NOT look into it; running scans never hurt anything
- Router -
If you have one, bypass it
- Other devices on router online at same time -
If you don't want to bypass the router, check to see how many other devices are live and sharing the signal
- If a wireless router, is it secure? WEP enabled? -
Don't want the neighbors "borrowing" your connection
Last but not least (and this seems to solve a lot of issues):
Reset the modem, router, and computer. Shut the PC down and unplug the power cables from both the modem and router. Let them sit unplugged for 10-15 seconds and plug the modem in first. After all the lights that should be on are (note, any "activity" lights may be off since the router is unplugged), go ahead and plug the router back in. After that's up and running, turn the PC back on.
If none of these tips work, it could very well be the signal to the modem or sometimes the modem itself. If the modem is one you're renting or leasing from the ISP, they should allow you exchange it for a new one. If you're having a technician come out to your house to check the signal, ask that he bring out a new modem.