LLVM was supposed to be fast at execution time, due to clang optimization advantages, but in fact, in most cases, it's slower than all 3 pg_jitter backends, even not counting compilation performance differences. This is due to zero-cost inlining using compile-time pre-extracted code and manual instruction-level optimization.
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When it takes tens to hundreds of milliseconds, it may be suitable only for very heavy, OLAP-style queries, in some cases.