Yes That me if i have large layer with 100 object living with bullet That i hâve pour the same layer and enable the cell render?
I guess you are asking if, if you have 100 object with bullets, the render cell is worth ut, well, it seems that it may not be worth it in that case as this feature saves up time for non moving objects (if you have a huge mostly static scenery, it is worth it, however, due to the fact it is more a micro optimisation applied to a lot of objects, the performance gain can be lower than the cost, and moving objects should avoid that as in their case, it is a loss: checking if they need to change their cells cost much than not using them)
also keep in mind that this option was introduced especially for gales with large environnements composed of a multitude of single non changing instances that do not move (movement related to the layer they are on).
however, since you can turn it on and off in entire layers, you may be able to just test it out and see if that works well or not in your case.