Severe networking problems

[Idiocritic]

Hi there

I recently installed Ubuntu 9.04 on a Fujitsu-Siemens Esprimo Mobile V5535 Laptop

It has an SiS 191 Gigabit Ethernet card, and an Atheros 5007EG wireless card

To begin with, the connection configuration was so bad I could only access Gmail and everything else was too slow to even work.

I then came across a solution in a bugs page whereby I changed MTU to 1492 and the connection now actually works.

HOWEVER

Everytime a browser or apt-get makes a fresh connection request, it starts transferring data real quick 150-300 KB/s but then tails off exponentially, and within a few seconds is only bumping along at less than 1 KB/s.

The fact that the initial rate is nice and then drops off is evidence to me that somehow the bandwidth is getting lost/wasted/miscomputed by the Ubuntu system.

I know that SiS haven't exactly been helpful, but there must be some way to stop the bandwidth from dying in this way.

I would be extremely grateful and recompensing of anyone who can help me solve this. I have been through god knows how many forums and how to's - most of which are full of people who don;t have a clue.

I DONT HAVE A CLUE EITHER - which is why I am asking for help.

I am a noob and intend to stay that way. I dont want to learn how to recompile the vatican I just want my net to work properly so that I can download packages without leaving my PC on overnight.

Many thanks

Idiocritic

[Idiocritic]

in case this is useful to you

eth0 Link encap:Ethernet HWaddr 00:1e:33:09:e5:31
inet addr:130.79.156.86 Bcast:130.79.157.255 Mask:255.255.254.0
inet6 addr: 2002:824f:9d61:a:21e:33ff:fe09:e531/64 Scope:Global
inet6 addr: fec0::a:21e:33ff:fe09:e531/64 Scope:Site
inet6 addr: 2002:824f:9d24:a:21e:33ff:fe09:e531/64 Scope:Global
inet6 addr: 2002:824f:9cf4:8:21e:33ff:fe09:e531/64 Scope:Global
inet6 addr: fec0::8:21e:33ff:fe09:e531/64 Scope:Site
inet6 addr: 2002:824f:9d6b:8:21e:33ff:fe09:e531/64 Scope:Global
inet6 addr: fe80::21e:33ff:fe09:e531/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
RX packets:333013 errors:4728 dropped:0 overruns:0 frame:4728
TX packets:63865 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:88984680 (88.9 MB) TX bytes:9744568 (9.7 MB)
Interrupt:19 Base address:0xdead