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There are some demonstrations on this page: http://zimg.buaa.us/documents/

It feels very fast—has anyone worked with this who can speak to its effectiveness in a production environment?

It indeed seems super fast; when you toy with the rotation parameter in the first example the result is instantaneous.

It'd be interesting to know who uses this.

Are the demo pages accessible on your side? I can't at the moment. I sent a notice to the author.

Nevermind, it is already back online.