Rip, even the newest computers need optimized from time to time. The meter is the same for everyone and each member is able to deal with it accordingly. Members are still posting good scores on a weekly basis.
I have a cheap Acer 3800+ and don't experience a whole lot of meter issues. I keep my computer optimized. WGT can do somethings to improve the meter, but can't fix it completely. It's an Adobe flash problem.
I suggest you Defrag your computer and clear your flash and browser caches from time to time, and you'll have a descent swing meter. Is it going to fix it completely, NO, but it's a method that makes the meter manageable for all members.
Use the search box and type, "Optimize your WGT experience" this should help your meter issue considerable.