> Spend 90% of the time writing performance-neutral code in a modern high-productivity language and 10% on performance-critical code in a modern high-performanc

> Spend 90% of the time writing performance-neutral code in a modern high-productivity language and 10% on performance-critical code in a modern high-performance language. What about the other 80% of your time spent trying to get those things to inter-operate in a way that doesn't destroy the good parts of both?