- JSON: stringify 161ms; parsing 155ms

- JS-YAML: stringify 13599ms; parsing 813ms

- YAMLJS: stringify 1009ms; parsing 4714ms

https://gist.github.com/jeremychone/700b6ed721565e2488a2cff60b5ad749

Seems like each Yaml's implementation is either fast at parsing or at serializing.