Burnout92, have you ever played The Binding of Isaac? That game was made in Flash. If you have played it, you'll know that there is a lot of lag at some points in the game(Even on a really beefy(Or should I say Horsey) PC with around 4GB of RAM, and it even lags on my friend's PC, which has a 4GHz, quad-core CPU), and that lag is caused by Flash. Flash is slow. Feel free to disagree with me, and please do correct me if I am wrong(If this makes me seem aggressive, I apologise and would like to make it clear that I am just trying to point out that maybe HTML5 or Java would be best for this kind of thing).

And about WebJJ2, is that still being worked on?