On Wed, 4 Nov 2020 at 22:22, Wolfgang Schuster <wolfgang.schuster.lists@gmail.com> wrote:

There was never a real test for the performance but when you enable the checker in the example below (which works only with LuaTeX) the second list is slower.

% engine=luatex
\starttext
\testfeatureonce{10000}{\getcheckedparameters[test][xx][a=b,c= d, e = f]}
\enablecheckparameters
\testfeatureonce{10000}{\getcheckedparameters[test][xx][a=b,c= d, e = f]}
\stoptext

Indeed the checked version is almost twice as slow, and the definition of \getchecked parameters looks confusingly intimidating to follow, so I give up figuring out the logic here.