Max doesn't really exist yet, at the moment it's just gameguru with new UI and some updated features, there's no point in asking for demos to test performance yet because between now and the September release they will be completely changing the core of the software, there will be a shift to 64bit, a completely new terrain system, and a whole new rendering and lighting system. Don't expect any demo levels to test until nearer the release, and if we do get some earlier don't expect the performance to be anything close to the final performance.
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