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From: KRW1@NS.CC.LEHIGH.EDU (Kevin Weiner)
Newsgroups: comp.windows.ms
Subject: RE: Should DOS apps run slower under Windows
Message-ID: <23069117.50.29KRW1@lehigh.bitnet>
Date: 23 Jun 91 22:50:09 GMT
Lines: 12

DOS apps will generally run slower under 386 enhanced mode, even
if running as exclusive.  Enhanced mode virtualizes much of the
system hardware, and depending on what the app uses, slowing can
be significant.  For example, rapid checking of the system timer
(normally low overhead) causes a slew of virtual machine activities.
Another major speed factor is the extent to which the app uses
standard DOS services and memory-resident drivers, all of which
require mode switches between protected and real mode.


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Kevin Weiner   Lehigh University Computing Center   (215) 758-3991