Just to say: I knew this option but I had not wanted to turn to "high performance" because it turns your Windows design as standard (like Windows '98).
By reading this post yesterday, Apex, I told me "and why not to turn to High Performance and to test it while playing WGT"... and sincerly I can say that the difference is here: my swing meter is really smooth like silk and very reactive now when you click.
I must say it is a very good post and I think that will help a lot of people here.
Thank You Apex.