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PA Particle Field is a GPU Based alternative particle system, built from scratch specifically designed for looping ambient effects (though it can do so much more). Built to reduce drawcalls, fillrate and CPU overhead (especially on mobile devices), each field supports up to 16250 particles with just 1 drawcall and can be fully customized.
Get it on the Asset Store:...
PA Particle Field - Superfast, GPU Based, Persistent Particles