I'm pretty sure this hasn't been true for 20 years. Tcl 8.0 introduced a form of byte compilation. [1] While the comments might slow down the compilation a bit,

I'm pretty sure this hasn't been true for 20 years. Tcl 8.0 introduced a form of byte compilation. [1] While the comments might slow down the compilation a bit, I doubt they have any impact at runtime these days. 1] https://www.tcl.tk/software/tcltk/8.0.html#What's%20New%20in%20Tcl%208.0 https://www.tcl.tk/software/tcltk/8.0.html#What's%20New%20in...