The bridge itself is not slow. Rather it can be a bottleneck depending on how much data is sent thru it due to the serialization/deserialization. Think in terms of JSON.parse in the browser. Parsing a couple hundred records is fast, but if you try 50k records, then your performance suffer.
Same for react native I'd think.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.