Meanwhile I was able to run the benchmark on MRI Ruby 2.1.0 and compare with 3.0.0 RC1; here are the results: http://software.rochus-keller.ch/are-we-fast-yet_c

Meanwhile I was able to run the benchmark on MRI Ruby 2.1.0 and compare with 3.0.0 RC1; here are the results: http://software.rochus-keller.ch/are-we-fast-yet_crystal_ruby_2_3_lua_node_i386_results_2020-12-23.pdf http://software.rochus-keller.ch/are-we-fast-yet_crystal_rub... Ruby 3.0 RC1 without JIT is factor 1.2 faster than Ruby 2.1.0; Ruby 3.0 with JIT is factor 1.4 faster than Ruby 2.1.0. So definitely less than factor 3. Unfortunately the benchmark didn't work with Ruby 2.0.