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Re: Slow Version 4 Front End

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  • Subject: [mg18793] Re: Slow Version 4 Front End
  • From: "P.J. Hinton" <paulh at>
  • Date: Thu, 22 Jul 1999 08:19:18 -0400
  • Organization: "Wolfram Research, Inc."
  • References: <7mp3gt$>
  • Sender: owner-wri-mathgroup at

On 17 Jul 1999, Bob Stagat wrote:

> I'm using Mathematica 4 on a PowerMac. When I was using version 3, if I
> evaluated a cell that contained a very simple expression -- 2+2, say --
> it would evaluate very quickly -- in some fraction of a second. Both
> measured in CPU time, as evaluated by the kernel's Timing[] function, and
> in wall clock time, as evaluated by the Front End's "ShowTiming" option.
> With Mathematica 4, evaluating a cell takes an absolute minimum of about
> 4.2 seconds of wall clock time, as indicated by the Front End's
> "ShowTiming" function -- and also by my monotonically increasing
> frustration level. Even for trivial evaluations, like 2+2, for which
> Timing[] returns {0. Second, 4}, but which the Front End shows took 4.42
> seconds of wall clock time.
> Why is the version 4 Front End so abysmally slow in communicating with
> the kernel? What in the world is consuming this 4+ seconds of overhead on
> every single thing I evaluate? Are there any options I can set to
> eliminate these inordinate delays? I know it doesn't have to be so,
> because version 3 never exhibited this frustrating behavior.

Delays like the one you are observing have been reported by other
Macintosh users.

If virtual memory is not enabled on your system, you may want to try
switching it on.  Users who have this problem often report that this makes
the delays go away.

We realize that enabling virtual memory may not be desirable for your
situation.  Please be assured that our development group is working to
address the problem. 

You are also encouraged to contact Wolfram Research Technical Support

notifying them that you have encountered this problem.

Thank you for your cooperation and your patience.

P.J. Hinton
Mathematica Programming Group           paulh at
Wolfram Research, Inc.

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