Speed of Make 3.79.1

[David Murrells]

Hi,
        We've recently moved to GNU Make 3.79.1 (from 3.77) on Windows
NT and 
have noticed that on a large project there seems to be a noticeable drop
in speed.  The drop is very noticeable during the automatic dependency
checking which is done at the beginning of a build.  Our dependency
checking is done in a standard emough way (a .d file for each object
file,
with the .d file containing all the dependencies, and all the .d
file included from a centralised makefile).  The examination of all
the dependencies in 3.79.1 is noticeably slower than it was in 3.77.
I was just wondering if anyone else had noticed/investigated this
behaviour
and could provide some pointers in my investigation.

Thanks,
Dave Murrells