Well about a month ago, I switched routers from an old d-link probably 5 years old to a newer linksys router. Used to get download speeds averaging in the 800kb/s range spiking to 1400kb/s on the average file download. Now that I've switched routers I can't even break 400kb/s. I really have no idea of where to start with this, anybody have any insight?
It shouldn't have made much difference honestly. You will more than likely need to open your web browser and goto the IP address for the router and check the settings for the NAT'ing and see if it has a firewall built into it, etc.
If you're on wifi maybe the signal is weak. Maybe it operates at the frequency and channel your home cordless phone does! Troubleshooting an issue like this is the pits. Especially since internet speeds vary on how many users there are, time of day, etc.
What model Linksys did you get? If it's one of the new E1XXX series, try switching the the wireless channel width to 20Mhz only instead of Auto. You can do this by opening your browser and going to 192.168.1.1. The username and password should be admin for both.
Also, like Chief said, it could be operating at the same channel frequency as other wireless devices in your home. If you have an Android device, download an app called Wifi Analyzer. This will scan all wireless channels within range and show you which ones have the most traffic. You can change your router to operate at the least busiest frequency, and that should improve it if the first suggestion doesn't fix it.
first thing to know is if you are wired or wireless... I agree with Chief though, you should look at changing the channel to see if you get less interference.
Only 3 channels are truly unique (1,6,11) so I would suggest switching to one of those three. Then check download speed with a direct connection to the router(http://speedtest.net/) and then try it through the router to see if it's any slower. I'm a network engineer for an ISP so if you have any questions feel free to PM me.
What model Linksys did you get? If it's one of the new E1XXX series, try switching the the wireless channel width to 20Mhz only instead of Auto. You can do this by opening your browser and going to 192.168.1.1. The username and password should be admin for both.
Also, like Chief said, it could be operating at the same channel frequency as other wireless devices in your home. If you have an Android device, download an app called Wifi Analyzer. This will scan all wireless channels within range and show you which ones have the most traffic. You can change your router to operate at the least busiest frequency, and that should improve it if the first suggestion doesn't fix it.
EDIT: Also, who is your ISP?
ISP is Comcast or xfinity, whatever they call themselves these days. I'm running the computer wired right now. Wireless is equally slow. And yes it is one of the new linksys routers. Its a E1550.
I experienced switching routers before and it didn't affect my speed. If I do get intermittent signals, I would simply power cycle and everything goes back to normal. If you try using your old router (if you still have it) and the speed remains, then the issue truly is with your new router, but if you get the current speed using your old router, then contacting the tech support of your ISP might be a good idea.