[radlad]

It sure has maps though... logrus famously uses `logrus.Fields{"key": "value"}`

[morelisp]

And logrus is one of the slowest loggers by far, in part because of its heavy map usage.

[dgsb]

It's also the reflect on the value part which slows down things. It could be improved but it's hard to do that without breaking interface. It's so widely used that a major bump wouldn't that useful.

[JonChesterfield]

I'd expect it to be mostly called on map literals, at least a compile time constant set of keys. That should be amenable to a targeted compiler optimisation.