I finally found a combo of things that ends all lag completely for me on FFR...
FYI, using Windows 7 Ultimate 64-bit so this will probably work best for those on that OS. Anyway, I've been really trying hard to find better solutions to reduce flash lag and my GOD... I really found a true solution. Like holy ****e amazing good.
H'okay, so, I'm using the newest Firefox(oh and with this I just have the typical add-ons like adblock, etc.):
http://www.mozilla.com/
And with firefox I'm using this version of Flash 9. Yes 9, not 10.
http://forum.jayceooi.com/viewtopic.php?f=6&t=82
!UPDATE! I tested this method with flash 10.1 over a Firefox, Chrome, and IE and they all worked just as good as using flash version 9.x. So feel free to update to the latest flash player. I hope it works fine still for you all as well. If it don't, just uninstall flash player and re-install the 9.x version. You can DL a flash player uninstaller from the attachment I placed on this post.
Now just recently, gamebooster 2.0 came out, it's free and FRUCKIN' AMAZING! Get it. Once you install it, it shows a list of all the services n **** that it will close, check ALL of these services and then turn game booster on.
http://www.iobit.com/gamebooster.html
Now once you have these items, right click on any flash.swf item, go to settings, uncheck the "Enable Hardware Acceleration" option.
Upon doing all of these things, as they did for me, I HOPE they work just as good for you. I'm dead serious when I say I don't get any lag, like... at all. None. Zilch. Not even random small lags at times. I pray this helps everyone on any windows OS(don't know if it works for mac/linux, haven't checked) cause my lord it really helps me.