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Ruby 1.9 rewarded your upgrade efforts by running twice as fast. There was a lot of enthusiasm to migrate.

Python 3 still seems to reward you by running slightly slower. Where's the hook? Marginal improvements to language design are bit of a weak sell for a language that's already pretty nice.

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All of the testing I've done with real-world code has shown an improvement of 10-20% moving from 2.7 to 3.4. I believe 3.5 made some slight further improvements.

If only CPython3 wasn't completely blown out of the water by Python2's production-ready PyPy. That said, my tests are the exact opposite of what you're claiming- I've been doing the same benchmarks on all the CPython3 releases since 3.2. I think you're the only person I've heard make that claim in fact.

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