Disclosure: I manage the Ion and PartiQL teams at Amazon. We have done some work on performance comparisons with the ion-java-benchmark-cli tool (https://githu

Disclosure: I manage the Ion and PartiQL teams at Amazon. We have done some work on performance comparisons with the ion-java-benchmark-cli tool (https://github.com/amzn/ion-java-benchmark-cli https://github.com/amzn/ion-java-benchmark-cli). Right now you can compare JSON serialized with Jackson and there is a pull request (https://github.com/amzn/ion-java-benchmark-cli/pull/27 https://github.com/amzn/ion-java-benchmark-cli/pull/27) for comparing against CBOR that should be merged soon. We are always happy to hear suggestions for what is useful in this area.