try restarting computer. did you update your flash player recently? check to make sure you have only ONE flash player ENABLED. having TWO enalbled will wreck havoc with meter. tey different browser(maxthon has good meter) make sure your computer is not running hot. also try playing with WGT fullscreen setting( not BROWSER fullscreen) click 4 little arrows at lower right and wgt fullscreen setting will come up. image will be a bit fuzzy but meter smoother(its the only way i play. also in settings, make sure REFLECTIONS and PUTTING grid are OFF. also try setting your computer to HIGH performance setting. OR do ALL of the above!
i have had all of these problems at one time or another, there are hundreds of things that cause meter stutter.