I just tried flash on my laptop (MS Edge) and the meter is silky smooth, even smoother than the new version's meter.
The jumpy/stutter/skipping meter problems are most likely ALWAYS caused at your end so there 's nothing WGT or we, other players can do about it for you unfortunately. :-(
Try to clean EVERYTHING with CCleaner for instance, not only the flash cache (+ restart your computer), and also check if there's been any program or software recently installed, edited, updated or removed that might affect the graphic card area and its performance.
Hope you have a better luck with it soon.