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Microsoft KB Archive/103406

From BetaArchive Wiki

Full Screen MS-DOS Application Runs Slowly


The information in this article applies to:

  • Microsoft Windows NT Server version 3.1
  • Microsoft Windows NT Workstation version 3.1
  • Microsoft Windows NT Advanced Server, version 3.1


At times, your graphical, MS-DOS-based application runs very slowly in full-screen mode. You may notice this behavior is triggered by switching the application between an icon and full screen state. Also, if you press a key, the application speeds up for a short time.


The Windows NT virtual MS-DOS machine (VDM) enabled idle time detection while the application was in full-screen mode. Because Windows NT does not trap video activity while an MS-DOS - based application is running in full-screen mode, it assumes the application is idle and reduces its execution priority. The reason the application speeds up when you press a key is that Windows NT detects keystrokes at all times; when the activity is noted, the status of the application is changed from idle to active.


If you experience this behavior, use PIF Editor to create a program information file (PIF) for your application. In the Advanced Options dialog box, disable Detect Idle Time under Multitasking Options.

Additional query words: prodnt

Keywords : kb3rdparty kbinterop
Issue type :
Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW310 kbWinNTSsearch kbWinNTS310 kbWinNTAdvSerSearch kbWinNTAdvServ310 kbWinNTS310xsearch kbWinNT310xSearch kbWinNTW310Search

Last Reviewed: October 27, 2000
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