I am aware of the various published test results where CoreCLR shows fantastic speed-ups compared to Mono, e.g. when calculating MD5 or SHA hash sums.But my measurements based on the Are-we-fast-yet benchmark suite (see  and  show a completely different picture. Here the difference between Mono and CoreCLR (both versions 3 and 5) is within +/- 10%, so nothing earth shattering.Here are my measurement results: comparing the same benchmark on the same machine run under LuaJIT, Mono, Node.js and Crystal. comparing Mono, .Net 4 and CoreCLR 3 and 5 on the same machine.Here are the assemblies of the Are-we-fast-yet benchmark suite used for the measurements, in case you want to reproduce my results:  was very surprised by the results. Perhaps it has to do with the fact that I measured on x86, or that the benchmark suite in use includes somewhat larger (i.e. more representative) applications than just micro benchmarks.What are your opinions? Do others have similar results?