I've been using C2 for a few weeks now, trying to get a feel for if I could use it to make hobby games in my spare time.
I've always found it fairly slow and jerky on my slightly old laptop. But now my test game has slowed down to unplayable.
I'm an experienced game developer so I'm confident that I'm not making any obvious mistakes and that my data is all tidy etc.
So the question is - what are the performance gotchas. Is it the number of sprites, size of sprites, number/complexity of physics objects, number of layers, event sheets, collision types, paralax scrolling.
Of course the answer is that it's all of these things but are there any that are a particular problem, that maybe you wouldn't think of.
What would be cool is some sort of profiler - but I imagine that's a way away, even if possible at all.