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If we launch an RDP session in the Wyse RDP session, it's work fine.
So, i'm thinking that the problem comes with the Wyse RDP protocol !

After some test, the good command line with USB, SDCARD import and Audio is :

rdesktop -f --disable-offscreen-cache -r sound:local -r disk:wyse=/auto -k fr-fr @IP@

-k is for french Keyboard
@IP@ is the IP address of RDS Server

How good is the performance with MS Office apps?
We've noticed what I term as being poor performance on day-to-day tasks such as Excel data entries, which has been ongoing since we started on version 1.18.

Wyse/Dell have been very unhelpful in troubleshooting, mainly claiming that we are the only customer having experienced this.

We found if you use rdesktop through the terminal, it seems to be quicker - so I agree with your suspicion that the Wyse RDP protocol has issues.

For MS Office, it seems to work normaly..
We found a workaround to this problem.
We have made a custom shortcut like this :
rdesktop -f --disable-composition --disable-nla --disable-glyph --disable-offscreen-cache -k fr-fr --disable-remotefx X.W.X.Y.Z
But we need to complete this in order to import USB slot...

I know I'm reviving a very old/dead thread.

Can you tell me how you create a shortcut on a wyse term (ubuntu thin os)?

We are having slow RDP problems.