Hello there, while I am still coming to grips with C2 myself, the best options I have seen so far are basing things on dt (delta time) which by default most platform behaviors should be. You can use dt to calculate the amount of time that has passed and base things off of it instead.
Maybe some of the others here will be able to offer some better explanation on it.
On a side note, I love spriter, great work! And just for my curiosity, is the game you're working on Nnar?