The author pans meta-tracing and shows a graph of TruffleRuby having really crazy runtime behavior. However, it looks extremely suspicious - like the kind of thing you'd see if there was a memory leak and the garbage collector was running constantly.

Most people seem really excited about the results coming out of Graal and TruffleRuby seems to have some really impressive results in general, so the graph is surprising. It's also missing a bunch of details, so it's hard to speak to its voracity - for example, what are the different versions of the runtimes, what flags were used, on what hardware?

As a counter example, there's a different (admittedly old) result where TruffleRuby beats cruby on the same benchmark by 4.38x. https://eregon.me/blog/2022/01/06/benchmarking-cruby-mjit-yj...