Last week flash updated, WGT had an update, and on Fri. FF updated...simply put somehow something on your PC is no longer compatable...I know this because I have several PC with newer operating systems that haven't updated that still work just fine, but I don't like playing on the game screen size they have.
Regardless of what some of the experts above say, it isn't as easy as changing browsers....
Basically I have rolled back the flash version twice, rolled back FF twice, and tried every f'n browser on the internet and nothing works as of yet....my meter was perfect, but got a little worse with each of the last 3 WGT updates, Fridays FF update was the straw that broke the camels back FOR ME, some were already having problems.
I have NEVER had the game play this bad before, meter jumps, wind isn't affecting anything, click and the meter runs way past the ding, however if your waiting for a WGT or FF update to fix it, consider yourself screwed!
For example, the last time my game went crazy it ended up being my ZoneAlarm firewall believe it or not, updated it and everything was better than it was before it went crazy...
Start looking through and updating or last resort removing your addons, firewalls, AV's, look at your processor use, your memory, etc because it is on your PC....