slow intermittent speed with Verizon FIO

Cuenca

Registered
I just switched from TimeWarner to Verizon FIOS as my ISP. This happened last Tuesday. And now my wi-fi is SLOW and I'm not getting the speed I was used to (I have the 5 Kbps plan). When I use the ethernet it's fine but when I go wireless my mac just won't stay on the same speed. It goes from 5008 to 198 in an instant.
I downloaded the speed optimizer (nothing)
hard reset to the router (nothing) (at least not permanently)
I connected my old router to their router (and nothing)
Xboz 360 works fine
PS3 works fine
But Two macs have speed issues

Verizon can't find the problem. Is there an compatibilty issue? Do I need to do something?
 
Hi Cuenca,

What settings do you have for the wireless? Which encryption, password type, are ACL in use etc? Is anything in bridged mode?
When the Macs are connected to the network, is there any slowness on the PC or Xbox side?
What kind of ping times do you get from the Macs to the router vs out in network vs the same values from the non-Macs?
Which version of OS X do you have currently installed? 10.5.1, 10.4.x, ..?
What kind of applications accessing internet are in use on the Macs (other than browsers, mail, chat programs) - any difference when any of them is not in use? E.g. some p2p applications tend to make any network sluggish.
Sorry for a mountain of questions, but there are a mountain of possible reasons for the slowness...
 
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