Glacial ClearWire Download

[Kent West <westk@acu.edu>]

I'm having to download a lot of data via an aptitude dist-upgrade, and 
the download process is glacial, pulling down 6Kbs or 90Kbs, dial-up to 
just-barely-better-than dial-up speeds. I'm using ClearWire, but saw 
even slower speeds on Xanadoo (also a wireless ISP). A Windows computer 
in another room (shared through a Linksys wireless/switch ran really 
slow with the Xanadoo; I'm unsure about the ClearWire. Is my problem 
likely to with the ISPs, or with something internal to the local network?

(I can't say if these slow speeds are normal for ClearWire; this isn't 
my house/network/computer; I do know they switched from Xanadoo to 
Clearwire because they borrowed a ClearWire modem for a week and it was 
SO much better than Xanadoo speeds.)

Are there some tests/diagnostics to determine if the problem is local 
(malware spewing out traffic from the Windows box, congesting the local 
net; flakey router; misconfigured NIC on this Debian box; etc?)?

Thanks!

--
Kent