The meter functions on your computer, not on WGT's server.
Any meter issues you have are local to your computer system.
You need to have as few programs or other processes as possible running. In particular check what applications/processes are running in the background. Shut down as many as possible.
Turn off as many Menu > Options as you can. I set the Flash Quality to - Medium, and only leave on Aerial Multi-Cam, Aim Arc, and Ball Trails (Replay).
I use Chrome, have the absolute minimum of applications running, and have only 2 tabs open - the Game page and WGT Caddy.
Lastly, it seems to help smooth the meter if you take a practice swing.