How to spawn in particles that don't move

I am trying to make an application for the Vision Pro where the particles don't move but rather stay still so that there is no lag. For example I am trying to spawn in a 100 particles here:

I want the particles to remain static but spawning in many causes the simulator to lag. Also is there maybe a way i can get a particle system to follow a specific shape like the one i have in the image.

Currently, I have multiple model entities that take on a particle system component

    for i in 0..<100 {
            let newEntity = ModelEntity()
            var particleSystem = particleSystem(color: newColor)
            newEntity.components.set(particleSystem)
            newEntity.position = position
            newEntity.scale = scale
            stars.append(newEntity)
        }
    }
    func particleSystem(color: UIColor) -> ParticleEmitterComponent {
        var particles = ParticleEmitterComponent()
        particles.emitterShapeSize = .init(repeating: 0.02)
        // make burst smaller
        particles.emitterShape = .sphere
        particles.mainEmitter.birthRate = 1
        particles.mainEmitter.lifeSpan = 2
        particles.mainEmitter.size = 0.02
        particles.burstCount = 50
        particles.speed = 0.01
        particles.mainEmitter.isLightingEnabled = false
        particles.mainEmitter.color = .constant(.single(color))
        return particles
    }