On 03/09/2016 12:53 PM, John Wiegley wrote:
>>>>>> Eli Zaretskii <eliz@gnu.org> writes:
> 
>> I concur that the current C mode is much slower than it was several releases
>> ago. My personal subjective impression is that it gets slower with every new
>> release, and I suspect that the main reason is our desire to support more
>> and more C quirks and subtleties. If this is true, I'd be glad to go back to
>> a simpler C mode, which sometimes mis-fontified or even (gasp!) mis-indented
>> an occasional rare construct, but to get back the speed we enjoyed in the
>> past.
> 
> I entirely agree, Eli.
> 

As someone who regularly works with C++ code written by people who want
to use every new language construct that comes along, cc-mode is already
barely usable from a correctness perspective. I find cc-mode's
performance adequate. Simplifying cc-mode further would make it and
Emacs much less useful for me.