Hi, > a sample lua script runs twice slower with texlua of TL2017 > than with the texlua from TL2016 and bare lua 5.3.3 I also > have on my mac os x 10.9.5
I am not sure if this is still relevant (I haven't followed the whole discussion). Anyway: on my system (latest Mac Laptop with up to date software) I have the same results with tl2017 and tl2016 (minor differences of course): $ time texlua collatz.lua real 0m14.837s user 0m14.552s sys 0m0.106s $ time texluajit collatz.lua real 0m10.231s user 0m10.205s sys 0m0.012s (similar with LuaLaTeX and LuajitLaTeX) Patrick
