Traffic Lags On Cisco Switch (Catalyst 2948G)(

I recently asked how to configure a cisco switch (  Now it works, but all traffic on the switch is lagging.  Hooking up a basic retail purchased 8 port between the systems currently on the switch removes the lag (ssh logins, browsing to web servers, etc...) but going back on the switch causes the lag to return.  Below is the current running config (which is also the start up config):

Note: The OS is CatOS not IOS
Bear> (enable) show run
This command shows non-default configurations only.
Use 'show config all' to show both default and non-default configurations.
#time: Thu May 28 2009, 15:09:58
#version 6.3(5)
#system web interface version(s)
set password *****
set enablepass ******
set config mode text nvram
set banner motd ^C10.7.4.0 NETWORK TEST SWITCH^C
set system name  Bear
#frame distribution method
set port channel all distribution mac both
set vtp domain test
set interface sc0 7
set interface sl0 down
set interface me1 down
set ip route
set logging level cops 2 default
#set boot command
set boot config-register 0x2
set boot system flash bootflash:cat4000.6-3-5.bin
#module 1 : 0-port Switching Supervisor
#module 2 : 50-port 10/100/1000 Ethernet
set vlan 7    2/1-24
set vlan 24   2/25-48

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2003domainadminConnect With a Mentor Author Commented:
Since nobody could help me figure this out we have switched to a dumb switch, and are using a linux router to handle advanced tasks.
Are you using auto negotiate ? Perhaps the port is getting set to half duplex or not getting negotiated correctly and giving interface errors?
2003domainadminAuthor Commented:
How can I check/fix that?
I do not remember my Catos very well, how about a show interface ?
in IOS that shows the duplex and errors.
2003domainadminAuthor Commented:
Show interface sc0 doesn't show any errors. Just the interface config
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