Microsoft KB Archive/140515

= BUG: VDM Apps Can Cause Other Applications to Redraw Slowly =

Article ID: 140515

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.51

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This article was previously published under Q140515





SYMPTOMS
On WinNT 3.51, moving a VDM Application on the screen or changing its focus in relation to other 16-bit or 32-bit Windows-based applications (moving to the foreground or background) causes the Windows-based applications to redraw slowly taking four to six seconds.



CAUSE
Some VDM applications, such as Microsoft QuickBasic applications or Edit.com with the menu pulled down, have a thread that loops tightly while waiting for keyboard input. This thread, always being in the run/ready state, slows the redraw of other Windows-based applications.



WORKAROUND
This problem can be eliminated by creating a .pif file for the VDM Application using Pifedit.exe. Click the Advanced button, and reduce its Foreground and Background Priority by half.



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 3.51. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Keywords: KB140515

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