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I've not seen this before and I've got close to 100 of the 1234's at customer sites. Just gonna take a stab at things. Check all of your ports that are in use from the 1234 and make sure they are auto-negotiating correctly. If your in the console you can do "show int switch-port 0/1" etc.. and see what it negotiated at. Also look and see if your seeing any errors when you do that. Have you tried other file transfers? FTP or SMB and see if you see the slow downs with those as well. Looking at the config I'm gonna guess your using port 1 which is the server vlan? Have you tired other vlans? Also any reason you have it setup for trunk mode? I'd try setting it to access mode and change the vlan just as another test. Any chance you could put up a config from the 1224st thats working? I rarely see any issues with the 1234's unless they just up and fail. With the config you posted the switch is doing nothing but passing traffic so things should just work.
Hope this helps....