Renders pretty fast, doesn't require a lot of samples (16~32 is gonna be enough). Node setup is commented as much as possible. If you don't know what volumetric emission means, it means there's no geometry except for a box, containing all of this. All you see is generated with the material node setup and is procedural, any parameter can be animated.
https://youtu.be/htgBD_WIYIM
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