This issue has nothing to do with the server code and is a client issue. I've witnessed such an issue before when playing in windowed mode and cycling applications heavily. The character is moving at full rate of speed in reality but frames are being drawn at 15-20FPS making seem like your creeping along. You can try some basic render troubleshooting like toggling fullscreen/windowed mode (alt+enter) when it happens. If that fixes it, you've got a background application that is causing your problem.
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