PL/V8 maintainer here - yes, JSON/JSONB structures are brought through the C++/Javascript membrane, but for the most part it doesn't seem too slow (full disclos

PL/V8 maintainer here - yes, JSON/JSONB structures are brought through the C++/Javascript membrane, but for the most part it doesn't seem too slow (full disclosure, i wrote a mongo clone on PL/V8 a few years ago). but, there is also the ability to simply query from inside a function using plv8.execute(), which gives you the ability to use JSONB operators, which are much faster.