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Why is the Pendulum Setup available only in the Particle Update?

I have an immortal particle (spawned only once) with a pendulum setup. The “Pendulum Setup” module is available only in the Particle Update, I can’t initialize it in the Particle Spawn. Wouldn’t it be better for performance to setup the pendulum only once per particle spawn?
I’m curious if this module needs to calculate something every particle update.
I’m new to Niagara, so sorry if it’s obvious.