Headless lags in comparison to normal client.

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So I run a rather fast Server, if you want the stats you can always ask but I noticed that once I ran a headless server for dedicated use that everything in-game skips (sort of rubberbanding) but once I run the normal client on default integrated graphics and minimize the window the server runs just fine. Any ideas to why the headless client lags in comparison with just running the normal client?

 

(not to forget the normal client runs around an avg of 12 CPU where as the headless uses about 0 to 1 CPU).