"Hacktoberfest is a yearly promotion where developers earn a free shirt by getting commits into PJs. It's intended to increase contributions but places a large burden on maintainers. / To combat this, the rules were adjusted so only PJs opt-in via a hacktoberfest label can earn qualifying commits."
“Conclusion: panko is extremely fast but it's a C extension gem. As pure Ruby gems, Alba, turbostreamer and jserializer are notably faster than others. With Oj.optimize_rails jbuilder and Rails standard serialization are also fast. ”