React-native: why JS bridge is the performance bottleneck

[marialovesbeans]

People say we should minimize passing data via JS bridge. I want to know what exactly makes JS bridge slow? Serializing & deserializing should be fast, non? (aka can be done under 16ms)

Example of such claim made by Wix CTO: https://youtube.com/watch?v=OmiXlJ4ZzAo

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