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J806 and AVX performance improvements have fueled some interest in benchmarking J. Here is a comment from Wikipedia:

"Benchmarking is not easy and often involves several iterative rounds in order to arrive at predictable, useful conclusions. Interpretation of benchmarking data is also extraordinarily difficult."

But, benchmarking programs do not have to be complex.

Here is a simple AVX benchmark script.

Simple AVX Benchmark script

Simple AVX Benchmark Run, time, and compare AVX tests described by several contributors.