In nowadays the PostgreSQL offers plenty of procedural languages: pl/pgsql, pl/perl, etc

Are there any difference in the speed/memory consumption in procedures written in different languages?

Does anybody have done any test?

Is it true that to use the native pl/pgsql is the most correct choice?

How the procedure written in C++ and compiled into loadable module differs in all parameter w.r.t. the user function written with pl/* languages?

database postgresql stored-procedures plpgsql
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