Unity Game Optimization - Third Edition

Letting physics objects sleep

The physics engine's sleep feature can pose several problems for our game. Firstly, some developers don't realize that many of their Rigidbodies are sleeping during most of the lifetime of their application. This tends to lead developers to assume that they can get away with (for example) doubling the number of Rigidbodies in their game, and the overall costs would simply double to match it. This is unlikely. The frequency of collisions and the total accumulated time of active objects is more likely to increase in an exponential fashion rather than a linear one. This leads to unexpected performance costs every time new physics objects are introduced into the simulation. We should keep this in mind when we decide ...