Re: CC Mode with font-lock-maximum-decoration 2

[Gregory Heytings]

> > I think the bit you missed was:
> >
> > > I don't know what makes it [CC Mode with font-lock-maximum-decoration 2]
> >
> > Try it again with that setting.
>
> Indeed, that was it.

That being said, IMO that comparison is unfair, because Emacs Lisp has 
only two fontification levels, so font-lock-maximum-decoration t and 2 are 
the same (and likewise nil and 1 are the same).  A fairer comparison would 
be to use one less than the maximum level in each case, that is, 
font-lock-maximum-decoration 2 for CC Mode and 
font-lock-maximum-decoration 1 for Emacs Lisp.  In which case the numbers 
are much less favorable:

1. (benchmark-run 1 (time-scroll)) is 3.3 seconds for complex.el and 6.2 
seconds for xdisp.c, two times slower;

2. (benchmark-run 1 (font-lock-fontify-region (point-min) (point-max))) is 
0.25 seconds for complex.el and 1.75 seconds for xdisp.c, seven times 
slower.