Hey Ellis,
Swing meter performance can be directly affected by a few things. Here are some tips that will hopefully help you to get the issue sorted...
Please click here for helpful tips on optimizing game and swing meter performance. Please check to see if your system exceeds our minimum requirements.
There
are settings in the game menu that it might help to change. Try
turning reflections, background loading, avatar rotations, friend
alerts, and putting grid to OFF. The putting grid OFF setting is
especially important if you are having the most stutter on the green
when you are putting. You also might try setting Flash Quality to Low.
It
is important not to run other programs while playing, as this can cause
swing meter stutter. Even using other windows and tabs in your browser
can have an effect. Also, you should play the game in the original
window size, and not maximize it to full screen.