Bitmap speed

I’m trying to make isometric tiles and i heard bitmaps are faster than vectors since they don’t need to recalculate. Does this “no recalculation=faster” still work if i imported square bitmaps and skewed it to isometric diamonds then wrapped it up in a movieclip symbol?

And for 2d isometric sprites, where there are tons of animations for each action, as well as images of it in each angle it is facing in, is it still good to use bitmap, or are vectors better now?

Thanks in advance…