Real slow performance on 100mbit connection with WRT320N

I noticed that 100mbit connections on the WRT320N perform realy bad. I tried a XBOX and a Aspire One laptop, both have 100mbit ethernet. Throughput is about 1-2 mbit/s.
If I put a gbit switch in between peformance is good - 80-90 mbit/s.
So:
100mbit xbox/aspire > wrt320N > gbitNAS = 1-2 mbit/s
100mbit xbox/aspire > gbit switch > wrt320N > gbitNAS = 90 mbit/s (nice!)
for reference: gbit pc > WRT320N > gbitNAS = 200mbit/s (NAS can't perform better)
I tried various duplex and speed settings on the Aspire (not possible on the XBOX) but that dit not help.
Can't find any option in the WRT230N to tweak the interfaces. Running the latest firmware avail on this site.
Anybody suggestions please?

Yesterday I got my Asus O!Play HDP-R1 player to replace my XBMC@XBOX. The Asus has a 100mbit ethernet port. I connected it to the WRT320N and I was almost sure it would have the same issue, but it did not. It streamed MKV and DVD files without any issues.
I googled a lot on this issue and found that a lot of people have this issue with the XBOX and other gigabit router/switches. The solution they found is to manual set the switchport to 100mbit full duplex. However this seems not possible on the WRT320N.
So I think this can be solved by finding the right driver for the 100mbit host (which I guess is a problem for the XBOX..)
Best would be to have a way to set the switchport to 100mbit full duplex. So I hope Linksys can add this feature, or can advise how to set somehow with the current firmware.

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As I am not sure the cause, I have been reading and trying different things, last thing was to set the interfaces to Duplex Full
I did this on both the Ethernet ports on the routers, and both of the Fast Ethernet ports being used on the switch, but has not changed the speed that PC1 is getting.
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My girlfriend lives in a hill town in a fairly wooded mountain road. She cannot get broadband or DSL either, and the town will, probably never get it. She has satellite, and when it's working well it's great, but in bad weather or cloudy days, the reception is spotty and the satellite provider charges mucho buck for their satellite high speed internet acesss.
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We have performance problems when running a JClient application, if the Application Server is on a different machine in the same 100mbit network. In our application we open 6 panels with about 15 TextFieldBindings each, on a tabbed pane. Each panel has it's own viewobject on the server. It takes the panel allmost two minutes to start up. Our own code seems to perform reasonable, but between the last line of code and the actual visibility of the panel there is a long period of low intensity network traffic between the client and the server machine, while both machines have low CPU usage. We tried setting the synchmode of the ApplicationModule to SYNC_LAZY and SYNC_IMMEDIATE, but this does not seem to make any difference.
It seems as if the server starts throwing a lot of events after our code is executed, which are caught by the BC4J controlbinding listeners. The performance is a lot better if we have the server and the client on the same machine, and the database on a different one.
This kind of performance is not acceptable for this application. Are we doing something that should not be done with BC4J, or are we missing something? You must be hitting a performance issue regarding download of all property metadata for setting labels etc. on the UI (in case of remote-tier deployment).
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