Same thing for me except I have not been able to fix the problem.
The game started delaying/lagging yesterday evening, about 15h or so b4 the halloween event went live. Everything I do started delaying by about 1s, ranging from between 0,3 and 2s even. randomly.
I have tried removing hardware ac, it made things even worse in firefox.
I have tried reinstalling flash, I have tried removing cookies and all local browser data. I have tried removing all flash player stored data.
I have tried firefox, chrome, opera (and if you suggest trying IE I will find you and murder you), and all were reinstalled or freshly installed. The least lag I have is in chrome, but even there it is noticeable and highly annoying, making the game barely playable.
My graph drivers are up to date, there is no malware or other malicious software on my pc, I scanned.
It is not my connection, as everything else runs smoothly, and everything runs smoothly on my mobile version of the game on the same connection.
I have tried the flash player on mutiple ocassions elsewhere and it works fine, both for video and aps.
For gods sake league of angels2(I tried it just to see if flash was to blame) runs so smoothly with so many more graphics and a massively bigger virtual memory running on flash.
Everything else, all aps, work fine.
There isn't a single problem in any of the browsers anywhere else that I can find.
But I can tell you this... there is a noticeable memory bleed somewhere in the game, and only in FOE.
I know because I clear local data on a regular basis, every week pretty much, and after clearing it now, when it was cleared last time maybe 6 days ago, I was refunded a mysterious 10GB of free space. And no I have not run anything else in flash this past week other than FOE, and a couple youtube videos.
win7 user here, the other shouldn't matter in a flash game, but you can get it if needed.
And no, I will not format my drive for FOE, if you suggest this, look up solution under suggesting IE use.
Was something patched yesterday, or a patch went live just b4 the event? IT IS DRIVING ME CRAZY.