[cpitman]

No, that graph may be hard to understand. It shows the relative improvement each GC has made since Java 8, not the absolute performance.

[twic]

Ah, i realised it was relative, but i had assumed they were all relative to the same baseline! Should have been obvious from the way the bars are all level for JDK 8, really. That seems a needlessly unhelpful graph.

[kevincox]

They are essentially 3 graphs displayed together. It probably would have make sense to present them more separately.