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RE: Cygwin on Win10 much slower than Win7




From: cyg Simple
> On 11/2/2017 9:36 AM, Erik Bray wrote:
> > On Wed, Nov 1, 2017 at 3:50 PM, Nellis, Kenneth wrote:
> >> Since migrating from a Windows 7 laptop to one with Windows 10, I've
> >> noticed a significant speed decrease in opening a mintty/bash window
> >> from about 0.5s to 3.5s.
> >>
> >> I've narrowed it down to two bottlenecks in .bash_profile:
> >> to "cygpath" and "source".
> >>
> >> Each invocation of cygpath on Win10 takes about 0.12s while on Win7
> >> takes only 0.016s. Both are running 64-bit Cygwin 2.9.0, and cygpath
> >> version 2.9.0.
> >>
> >> The files being sourced are the same, but for example, one file,
> >> .bash_aliases, only contains alias statements and a few variable
> >> assignments. On Win7, "time" says it takes 0.000s, but on Win10 it
> >> takes 0.023s.
> >>
> >> The Win7 CPU is "i7-4600M @ 2.90 GHz 2.90 GHz" while the
> >> Win10 CPU is "i7-6600U @ 2.60 GHz 2.81 GHz". I can't imagine this
> >> difference accounts for a 10x speed difference. Also the
> >> Win10 machine has an SSD compared to the Win7 machine's SCSI hard
> >> disk, which would favor the Win10 machine.
> >>
> >> I was wondering if anyone else noticed such a thing or could account
> >> for this speed difference. Can I simply blame Windows 10?
> >
> > There could be a real issue here, but for what it's worth I haven't
> > noticed such extreme slowdown.  But I don't have a Windows 7 machine
> > to compare to.  I upgrade the one I'm on now from Windows 7 to Windows
> > 10 over a year ago, so if there ever was a difference maybe I just got
> > use to it and didn't notice.
> >
> 
> Maybe a network drive connection timeout issue.  Are all of the drives
> that were mapped in Win7 still reachable in Win10?
> 
> > I don't recall any major issues when I first upgraded either though
> > ¯\_(ツ)_/¯
> >
> 
> I don't recall any either.
> 
> --
> cyg Simple

Yes, I dismounted all but one and same network drive on both machines, 
and got the same results. The (faster) Win7 machine's network drive is 
connected over WiFi while the (slower) Win10 machine over Gbit Ethernet, 
which would seem to favor the slower machine. I hadn't mentioned that 
the timing tests were all performed on my internal C: drives, so don't 
think that network drives would be a factor.

--Ken Nellis