When you do everything in memory, its always faster.

The perf is not just for in mem, nuclio uses async and zero-copy IO to external file/db/stream (like Iguazio data platform), and has multiple parallel workers (unlike lambda, when 1 waits for resp the others continue or the same worker can do multiple non-blocking IOs, so same mem/cpu does 10-100 more work, and its faster than bare-metal)