In my last CC (Champions Gate) there was an IT person that was very knowledgeable and told me to use Maxthon 3. In which he instructed me to go from the latest level of Maxthon and go back to #3.
It must be a stand alone browser. Close out the one you normally use and any tabs that show up using Maxthon. Only WGT should be running.
I have no problem using it. Clean your Flash, do a defrag and disc clean on your C drive.
I don't even bother with the cashe/cookie thing. Works just fine.
You can in options before you play select no for sound, refections, help boxes of any kind, that will help the swing meter to operate smoother also.