I think if we can make architecture cheap to change, then we can make software that can be drastically optimised from a high level. I think techniques such as

I think if we can make architecture cheap to change, then we can make software that can be drastically optimised from a high level. I think techniques such as differential dataflow, materialized views and scheduling can optimise many performance problems. I often start with something fast and then try add functionality to it to make it useful. Architecture decides your performance characteristics.