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These results fix a few issues with the previous benchmark. It was also done on a newer version of Apache Jena, which has some optimizations to its IRI caching algorithm, positively impacting performance of the compared methods.
Jelly has also seen a few major optimizations in the meantime.
I cannot explain the performance regression in Jena Protobuf serialization. The setup was the same for this experiment, so it must be regression in Jena (5.2.0 vs 5.0.0). Or maybe something that changed in GraalVM 23, but I find this unlikely – Jelly also uses Protobuf and didn't get hit by that.