Over the course of the last two years, we've seen a more than 25% regression in build time. I've tracked this down to a handful of individual changes.

On of them is JDK-8278917, which causes hotspot build time to go up with 15-20 seconds on my reference machine (from around 195 s to 215-220 s).

It might be possible to change the inlining logic to avoid this performance hit when building, without sacrificing runtime performance.