Unity Game Optimization - Third Edition

Object pooling

Speaking of temporary work buffers, object pooling is an excellent way of both minimizing and establishing control over our memory usage by avoiding deallocation and reallocation. The idea is to formulate our own system for object creation, which hides away whether the object we're getting has been freshly allocated or has been recycled from an earlier allocation. The typical terms to describe this process are to spawn and despawn the object rather than creating and deleting them in memory. When an object is despawned, we're simply hiding it, making it lay dormant until we need it again, at which point it is respawned from one of the previously despawned objects and used in place of an object we might have otherwise newly allocated. ...