Optimize Particle Emitter with Massive # of Particles

Okay, so, I'm in a bit of a predicament. I have a particle emitter, and due to the nature of the game, it needs to output a massive number of particles - say around 10,000.

I know, I know, that's a ludicrous amount. The Profiler knows that too.

What are some methods I can optimize the particle system/rendering without reducing the number? (Please don't answer with "Reduce the number of particles", pretend it HAS to be held at 10,000 but still run smoothly.)

Thanks!