Reducing lag help

Yes i know what to do but is there w wasy where you can make things disappear when not on screen but reappear when the object is on screen???

Use the In View trigger to do this. I’m not sure that “disappear” and “reappear” are the right way to think about it, since if it disappears it will never be on screen again. You can maybe just turn off & on any expensive logic this way though.