Devs - one of my Admins and a regular were being suspected of speedhack. I have demos available for review as well as the output of "differences" from my admin so you can check his configs.
My admin said he was overclocking his CPU and the game was pretty laggy for him. He restarted and turned off OC and the issue went away. His CPU is an amd opteron 170 2.0 dual core and it was OC'd from 2.0 to 2.5 stock voltage.
I haven't received the differences output from the other regular player but he says he does not OC...
Let me know what you would like to see and I'll send it to you. I have demo and text file with differences for client.
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