Howdy! There is a node Now : >>Add Instances<< with an >>S<<, which takes in an array of transforms. I am using 4.25 both ISM/HISM (I’ve ALSO used this with ISMs in 5EA, so I assume its there for HISM too.) I’m only adding 1,000 a frame right now, seems fine! I was looking to see if Update Batches was faster or slower, so it sounds like Add Instances and UpdateBatches are the array input ways to update ism/HISM. Seeing that Add Instance requires a loop plus updatebatches, clearing the ISM/Array and adding addinginstanceS might be the fastest way OUT of BP to the engine(speed.) I make my changes the ISM/HISM only at the end of tick, only touching each once. I save a list for what needs to be done. Cheers -Roadless THE GAME