|First, what they don't tell you about 54G and 54Mbps wireless is that you only get half of that in actual throughput speed, about 26Mbps. (The rest is taken up by networking overhead). |
Second, unless you have multiple radios in that wireless router or access point (not antennaes, but actual radios), that router is like one port for network connectivity, so that speed gets divided between all active connections. So if you got two wireless clients actively communicating, that's 26Mbps divided by 2 = 13Mbps.
Third, if there's any type of interference or some signal degradation caused by any of the wireless clients, such as distance or by walls, the router will kick down the speed to improve signal strength for that one client, which will affect everybodys speed. So if the router kicks down to 36Mbps, divided by 2 because of overhead (18Mbps), divided by 2 active wireless clients, now you only have about 9Mbps max available for each client.
54G works on the 2.4Ghz spectrum. 2.4Ghz cordless phones can cause interference in this spectrum and I think newer cell phones do also. (Microwaves also affect wireless communication when running.)
There are only 3 non-overlapping channels for 54G, channels 1, 6 and 11. You may have more wireless network neighbors around in your new house than the old one that can be causing interference. Even if the Windows or the cheapy utility that comes with consumer wireless cards says the signal strength is excellent, they are not true spectrometers and you may still be getting noise from something else that's interfering with the signal.
Also, different building materials in houses or wall construction can cause noise or interference. Even in the same room, if the signal is bouncing off the wall all over the place it's going to result in a bad signal.
Cheap consumer wireless routers/access points experience performance degradation when using encryption because the hardware is of cheaper design. There's a reason commercial wireless access points cost $500 and up versus $60 consumer routers.
Last, sometimes routers just start going bad and their performance can start degrading over time.
I hope these points help in understanding all the variables that can affect wireless performance.
You said you tried channel 6 and 11, try channel 1 also. Also, are there nearby wireless networks with the same name (SSID) as yours? If so, your computers will get confused and try to intermittently connect to them, causing communication problems. Make sure you SSID is unique. You may also want to try upgrading to an N router. You won't get N speeds if your computer are only G capable, but N routers have diversity antennas that can help with signal quality on the router side.
Assume that I already did an Internet search.