Could performance of wiring be improved?

I'm adding compilation time tracing to scalac to show how long each file/class/method takes to typecheck. The trace drills down further to measure time spent in implicit searches and in macro expansions.

I generated traces for a relatively large Scala build: https://github.com/guardian/frontend. This project uses MacWire for DI within a Play application.

The generated report suggests that 4% of total compilation time is spent in the wire macro:

I'm having trouble getting a good look at this through Flight Recorder to make concrete suggestions about what could be optimized, but I thought I'd lodge this ticket as-is in the meantime.

Start by profiling the wire macro during compilation of a representative Scala build, using the compilation-time traces and Flight Recorder investigation described in the issue. Identify concrete sources of the reported compilation cost and establish a reproducible measurement; done means a verified reduction in wiring-related compilation time without changing dependency-injection behavior.