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"Rapid progress since June 2014"

Gee, I wonder what happened in June 2014 to inspire this....

What did happen?

I think he's reffering to mantle at WWDC.

Mantle is from AMD and dates back to 2013. It has nothing to do with Apple or WWDC.

You're thinking of Metal.

I think he's reffering to metal at WWDC. That's the only thing I can think of as being relevant that month.