I'm planning on making a new sidescroller game, but I wondered which sidescroller library would be the best, I made once one with ForumAccount's Library, but for some reason it lags sometimes (even with cpu % on low and no network delay), which is pretty weird... I've done a lot of things to fix the lag but nothing has changed at all...

I'm not planning on fixing the lag of this game, I wonder if there's any new sidescroller library available, I'd be up to pay for it if it's really good and it can let a decent amount of players play it in the future.

Any idea? Thanks.