Yes Ditje is right: hide and show the new entities dynamical.
Then it shouldn't be a problem to handle 100 entities. Besides you don't need 100 animations. Only place the animation sprite new when the player picks an object up.

@Ditje
Quote:
100 and more items shouldn´t decrease speed. It`s just 10% of possible.


It is possible to handle more than 1000 entities...^^

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