[txutxu]

Something is wrong with this statement:

    "Scala is great for performance, but quite bad at resource usage"

Maybe it's directly related to the next statement:

    "No-one in the core GOV.UK team had a deep knowledge of Scala, and particularly how the old router worked"

But the first statement, literally, does not make sense on its own.

[_pmf_]

> and particularly how the old router worked

Oh, then it's OK. It's always reasonable and a safe bet to rewrite something instead of understanding how something works, because after all, your predecessors were a dumb bunch and you (using Go! how cool is that!?) obviously know much more.

[mseepgood]

> But the first statement, literally, does not make sense on its own.

Why? There are other resources than CPU time, e.g. memory.

[txutxu]

"Computer performance is characterized by the amount of useful work accomplished by a computer system compared to the time and resources used." --wikipedia

Is there a different definition I'm missing? I think, a car can be "fast" and take too much fuel, but (in my book) a programming language cannot be "great for performance" while being bad at resource usage.