To clarify, the largest group of variables have to do with the local player's machine. This is why some players see no issues and others see it all the time. Other applications running, making demands on the CPU and RAM will affect the swing meter performance. That is why closing all other applications, windows etc... will improve the performance. Another way you can improve the smoothness of the meter is to downsize the game play window to tax the cpu less. We are looking into ways to minimize the local machine configurations and their affects on the meter. At the server level we are not even close to utilizing the full potential of the machines. The meter is not a server load issue.
If you have any ideas please let us know.