Are there any benchmarks available? It seems I can find very little (OptCarrot, some microbenchmarks, and some general assessments about usage with Rails), and

Are there any benchmarks available? It seems I can find very little (OptCarrot, some microbenchmarks, and some general assessments about usage with Rails), and a broad(er) overview is crucial to assess the overall performance (I suppose that you can have workloads where the performance degrades).