It doesn't matter how many bells and whistles your system has, you need to keep things minimal, stop using IE or Chrome, and keep things cleaned out as often as pos.
My desktop is a compaq basic of basics, bag of sh!t tower, It's around 5 years old now and it certainly isn't built for gaming.
My processor is a paltry dual CPU E2140 @1.6 GHz
It uses a week inbuilt graphics chipset.
It has only 2GB of RAM.
And I have no problems playing this game 90% of the time....and when I do start to get stutter, I close the game screen, google "clear flash cache" and delete the lot, then clear out the browser cache....I use rockmelt but maxthon is also very good......and resume the game, and the meter is silky smooth again.
I even play it on my 14" laptop that is even weaker than my desktop with no problems other than my screen is too small.
I can play in fullscreen mode ( 19" ) and even play while searching forums or watching videos, and using bandicam (that does slow things down a touch, but playable).
Some of it is down to WGT.....but most of it is down to something you're doing wrong at your end.