http://www.wgt.com/forums/t/385096.aspx
The player that started the above thread found an application was using up a lot of his CPU performance.
The meter plays on your computer, not on WGT's servers. So if the meter is not smooth for you, first suspect your computer.
I always use the latest release of Flash Player and don't have meter issues.
If your meter isn't smooth it's likely because some other application is using up part of your CPU's time.
Smooth meter - Optimizing your Windows computer