Re: M-x grep is too slow

[Kim F. Storm]

Richard Stallman <address@hidden> writes:

>     Looking with a debugger, a lot of time is spent in
>     previous-single-property-change.
> 
>     Maybe caching the last position of `directory' and `message' properties
>     would make a difference ?
> 
> Do you mean caching at the Lisp level inside Font-Lock mode?
> That might be easy to do.

I was thinking about doing it explicitly in compile.el...

> 
> Where is previous-single-property-change being called from?
> Maybe a change there is what we need.
> 

There are only a few calls in compile.el, so it cannot be too hard
to see what's needed.  However, there seem to be a call hidden in
a macro so it may not be trivial.  I'll leave it to the experts.

> 
> Aside from that, I have a feeling it is wrong for Compilation
> mode to turn on Font-Lock mode by default.  This nonuniformity
> in the control of Font-Lock mode seems wrong.

I think so too.

-- 
Kim F. Storm <address@hidden> http://www.cua.dk