You can't compare optimizations done on audio encoding/decoding (often hand written assembly) to something like PostgreSQL which has many moving/inefficient parts.

The optimizations on PostgreSQL are real if done correctly, it's just a very big project.

My point was that while Claude _is_ legitimately very good at optimising. It will also write its own benchmarks to test its optimisations which are frequently stacked in its favour. You have to be very careful that reported speedups are actually real