Effect impact on performance

For example, i got 100 objects on the map and i want to apply those the sharp or contrast effect. Will this have an impact on the game performance? or the game will somewhat pre-render the effect and use the modified sprite in the game to avoid losing performance?

No, it'll do it in real-time, so it will hurt performance as you scale up. A good way to reduce the performance hit is to apply the effect to the entire layer, and then create layers just for the sprites you want to affect.

Thanks, just the answer i was looking for, i was already planning to apply it to the layer. Good to know.